Why is the speed of light what it is? Maxwell equations visualized
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- เผยแพร่เมื่อ 3 มิ.ย. 2024
- Twitter: @arvin_ash The History Guy video on Maxwell: • Father of Modern Physi... . Why is the maximum speed of the universe the speed of light? Maxwell’s equations explained and visualized. Why is light so fast? What is light made of? Almost all modern technology is based on Maxwell’s equations.
Not only do they describe every electrical and magnetic phenomenon, but hidden within these equations is a fundamental truth about the nature of light, and why it is the ultimate speed of the universe. We are going to visualize the equations with graphics.
Objects have something called a charge. This is a property of matter like mass is a property of matter. If you have a static object with a charge, it will affect only other charges. And if you have a static magnet, it will affect only other magnets. But if you have a moving charge, it will affect a magnet. And if you have a moving magnet, it will affect a charge. That's what the four equations are telling us.
A charge is the source of an electric field. If I have another charge, you can understand exactly what force it will feel. The first equation is a formula that tells us how electrical charges create electrical fields. It is based on concepts developed by Carl Friedrich Gauss. Permittivity of free space is required in the equation. It is the resistance of free space against the formation of electric fields.
The second equation is called Gauss’s law for magnetism. It says that if you had the same sphere but it was a magnet, you will never find a configuration where the magnetic lines of force always point outward, or always point inwards. In other words, a magnet will always have two poles. There are no magnetic monopoles.
The third equation is called faraday’s law. This law says that if move a magnet, you will create an electric field. This equation tells engineers how to generate electricity from a generator.
The fourth equation is Ampere’s law. It says that if you have moving charge through a wire, or an electrical current, you generate a magnetic field. This requires a constant of nature called mu naught. This is the permeability of free space. This is the ability of free space to allow magnetic lines of force to go through it. Note that there are two terms in this equation, one term tells you the moving electrical charges can create magnetic fields, and the second term tells you that moving electrical fields can also create magnetic fields. This idea of magnetic fields being created from electric fields was Maxwell’s addition to Ampere’s law.
#maxwellsequations
#speedoflight
#electromagnetism
Both of these constants have to be measured, since they are inherent properties of nature. They are not derived from anything. What does this have to do with light?
If I take an electric charge and put it on a pole, and I just move it up and down, what will this cause? According to ampere’s law, if an electric field moves or changes with time, it would create a magnetic field perpendicular to that.
And because of the changing movement, the magnetic field would also be changing with time. And according to Faraday’s law the moving magnetic field lines would create another new set of electric field lines.
Now, since the same thing is happening to these new electric field lines, that is, they are changing over time, they would in turn create new magnetic field lines. And the new moving magnetic field lines would create yet more electric field lines. You have just created a self propagating wave.
What is the speed of this wave? You find this using advanced multivariable calculus which Maxwell was very good at. He comes up with is 1/V^2 = epsilon naught * Mu naught. Solving you get Velocity = Sq root (1/epsilon naught * Mu naught). So what the equations are saying is the velocity of this wave is inversely proportional the permittivity and permeability of free space. It makes sense that the velocity of any wave would be inversely proportional to the resistance of the substance it is traveling in.
You might ask, well why are mu naught and epsilon naught those exact values? No one knows why. These are just the constants of nature.
Now we take the measured values of these two constants, and do some simple math. The speed of the wave is about 300,000 km per second. Maxwell realized that light must be an electromagnetic wave.
About 40 years later another great scientist by the name of Einstein did his own thought experiments inspired by Maxwell’s equation. And his thought experiment was based on one simple assumption. He asked if the speed of light is an inherent property of space, why would this speed be any different based on the speed of the observer?
And it was from this simple assumption, that he came up with the special theory of relativity in 1905 which changed our ideas about the nature of time. - วิทยาศาสตร์และเทคโนโลยี
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For those of you wanting to know exactly how Maxwell derived velocity using, here is a source that shows the details of that derivation: www.wikihow.com/Derive-the-Speed-of-Light-from-Maxwell%27s-Equations
Hi Arvin, enjoyed the video - then ran to the Wikipedia and read about the vacuum permittivity (en.wikipedia.org/wiki/Vacuum_permittivity) - they seem to suggest that permittivity is defined by light which is itself defined as a constant and not the other way around. Can you tell a few words about this? Are they wrong? Thanks !!!
@@ivangligorijevic In modern times, since the speed of light has been very accurately measured, permittivity is indeed derived using speed of light. However, permittivity can be derived independently using magnets and electrical current. I believe Coulomb was one of the first to measure it. If you search on that, you may find his measurement technique.
@@ArvinAsh Thank you very much! The question is more philosophical than one of convenience. Its always hard to describe simply why is the speed of light indeed maximal and if you just postulate it this is on a different level than a "reasonable" explanation using electromagnetism. Therefore my question - on the link I provided, they treat the speed of light as a postulated value from which you derive the vacuum permittivity. So I am trying to understand what comes first and if it can be derived independently, this is a whole new level entirely (I was actually searching for it!) ?
lol thanks, I was just figuring out how to get v from the units, and now I see this. You have sparked my curiosity. Too much thanks, Mr. Ash.
There are aspects of light that can provide further hints about it's properties and causes. Light is only light due to friction as it is passing through a viscous substance/our atmosphere. We see the sun and it appears bright but space itself is pitch black because it has no atmosphere or viscous substance to cause friction. The sun actually emits only a "black light" that travels in a wave like Newton's kinetic cradle balls th-cam.com/video/uWChuDS-CbQ/w-d-xo.html through the aether rather than the actual light traveling any distance. Just like when you tip a row of dominoes, the first domino you push over is not the last domino to fall down. It is the force of the wave of the first push that travels instead.
I teach electrical theory at university and I’ve never seen such a brilliantly clear explanation of the Maxwell equations and their consequences - Many Thanks.
Try this video from the Science Asylum. Nick also explains very very well:
th-cam.com/video/UzW_jAJzlgI/w-d-xo.html
*+Richard Masters:* Except for the notable omission of Coulomb's law, the way it is done in the video is quite close in outline to how it was taught to me as a student, and thus is how I understand it. Since you teach electromagnetism, you probably also know that you can show using the theory of special relativity that a magnetic field is an electric field which is moving with respect to an observer. Indeed, special relativity is implicitly included in Maxwell's equations, such is the incredible genius of Maxwell!
Well sir Arvin ash has very crystal clear concepts
@@hiqhduke I'm certain Richard Masters has a better comprehension than the majority of people. Why a science degree holder would have to stand under an arts degree holder's opinion, is beyond ludicrous.
Though these equations are about reactions, not consequences. The Laws of Physics are OBSERVED, not enforced. Law from the Latin for 'ultimate' or highest truth. Opinion nor consensus are considered to be true.
There's a beautiful derivation of the equations of motion from 1 simple law of entropy I'll have to look in my physics notes
I've learned more about electromagnetism and the meaning behind Maxwell's equations in these 13 minutes than in 5 years of studying electrical engineering.
same, and i just learned a lot more than my doctor’s bs explanation about it
same here bro
same here. As a physics graduate that was brilliant
@patrick quinn knowing the equations in and out is not the same as understanding the insights about why there are so and how Maxwell came with them. This video helps with that, even if you know all about them mathematically
@@tonymchugh443 Were you really a physics student ? lol
Just imagine how Maxwell felt when he realized that he arrived at the speed of light... What epiphany! I wouldn't be able to take another breath from excitement.
This is a great video. Thank you. Amazing to see that the speed of light can be derived from those two constants -- vacuum permittivity and permeability of free space. It actually makes sense.
One of those things which are obvious in retrospective.
When you learn something like this, you realize that you didn't had an answer just because you were unable to set up a correct question.
And in this particular case the next logical question is:
Is there a substance with lower said resistances, than vacuum?
Superconductors are a suspect in this case, but considering my profanity, I possibly have just suggested complete bullsh!t)
@@Gizzeitare you suggesting a means to make light travel even faster? Is there a practical use for such a thing?
It's possible that instead of reducing resistance, you can increase reproductivity.... but not sure how you this can be done for something like faster than light space travel, unless it's a constant emanating field that travels with relativity of a space ship. But how do you slow down? Lol
wow, as a physics enthusiast, I’ve been looking for this level of understanding of “c” and how it can be derived for years, and this video nails it. Thank you, Arvin Ash!!!
th-cam.com/users/shortsgwTmITmB7Vs?feature=share my page e=mc2...here i proved experimentally that time travel is possible.
Everything in the universe is connected magnetically!! The speed of light is directly proportional to the magnetic field and frequency of light your reviewing and the magnetic field it travels through. E=MC/2 has little to do with anything. Think about this, What is the speed of magnetism?? Every living thing and all matter are byproducts of magnetism. Tap the center of a bar magnet on anything and it will loose weight.
@@vincecox8376 what are you trying to say? Speed of magnetism is C.
@@vincecox8376 What a genius.
I guess that's why they call it the electromagnetic spectrum genius...and this energy travels at the speed of c.
"There was a point in time when Maxwell was the only person in the world who realized this." That is pretty amazing.
World or even the universe...
wrong, there was that one guy that lived in Gambia near a river, sadly he died a day late from poisonous snake bite.
There was a point in time when I was the youngest person in the world.
That we know of.
Why was Faraday forgotten?
Watching this made my jaw drop, imagine that Eureka moment, when Maxwell realised the approximate measured speed of light matched his equation. Epic.
Imagine the expression on his face as he makes that connection.
And then, appropriately, a light bulb lights up over his head.
He probably felt like he had to tell somebody fast, just in case he dropped dead all of a sudden.
He would have written it down, where it would be found by a fellow scientist.
Imagine how he felt when he realised that light was electromagnetic radiation and only he knew it.
that must have been the happiest a person can ever be
The introductory text of Arvin A is a very nice one, although it is maybe not entirely up to date regarding lightwaves. As for "why/how" light is travelling as a defineable unrelative C we do not know exactly. There are many suggestions that do not actually explain how, but more help to confirm THAT...
There is a statue to Maxwell in Edinburgh where he was born , most people just pass by without realising what an important contribution Maxwell made to our understanding of how the universe works.
I have zero background in physics, yet you explain things in a way I can actually understand. It's fascinating. Thanks!
th-cam.com/users/shortsgwTmITmB7Vs?feature=share my page e=mc2...here i proved experimentally that time travel is possible.
@@bheeshmsharma4497 Sure you did, kid. Now go back in time and buy 10,000 shares of Tesla for ten bucks. :-)
This presentation of Maxwell’s equations is the best I’ve ever seen.
This presentation or introduction to Maxwell's Equations is how it is presented in all University Physics text-books.
@@graemej2599 haha
Agree. Very clearly put.
Joe Chang which would mean there is no light in space if i have understood correctly
Joe Chang so how can we see the sun?
As a former undergrad in physics and grad in oceanography, I wish all educators were required to be at this level of understanding, enthusiasm and preparedness. Its nice to see you to explain serious material so simply, as well as capture the attention of thousands of people in subject matter deemed widely as boring and drab. Thank you for doing this, I'm subscribing to your channel.
it's something A Einstein pointed out, but when we actually have a teacher like Feynman, or my father, they can make it clear to a 3 year old... my father explained the laws of motion to me by describing the arc of a ball thrown.. before he threw it... and described how we measure it... I have taught my son the same way.. he was in college calculus in 8th grade... it's not difficult... but I avoid fractions and use the metric system exclusively... people who use fractions think math is hard... it's not... and.. my friend P Michael Hutchins of MIT tells me... mathematics is pure logic... so it is... and that's what these series of equations are... he builds from one principle to the next to create a Gestalt... Maxwell and the early physics guys didn't have anything except intelligence and curiosity... and logic
I, too, subscribed a while ago. Videos so each to understand.
You're right Joe, Arvin has that special ability to communicate with his audience something a lot of instructors lack. Looking forward to catching up on some of his other videos.
Mr. Ash is very much like Richard Feynman when it comes to explaining complex concepts. This is the highest complement I can give to an educator…
Just imagine the thrill that Maxwell must have felt in that moment when the two speed limits matched.
th-cam.com/users/shortsgwTmITmB7Vs?feature=share my page e=mc2...here i proved experimentally that time travel is possible.
Same when Einstein realised the speed of gravity is the same as the speed of light.
Unfortunately, when he tried to unify gravity with electromagnetism, the strengths of the two forces were so different that it made unifying them impossible.
If only Einstein were alive now.to see m-theory. He'd realise he was on the right track all along.
Everything in the universe is connected magnetically!! The speed of light is directly proportional to the magnetic field and frequency of light your reviewing and the magnetic field it travels through. E=MC/2 has little to do with anything. Think about this, What is the speed of magnetism?? Every living thing and all matter are byproducts of magnetism. Tap the center of a bar magnet on anything and it will loose weight.
I was an electronic engineer in research and development for 35 years. I developed extremely sensitive detectors for gas chromatographs. The last 5 years of my career I was designing a Liquid Quadrupole Ion Trap Mass Spectrometer. I never used Maxwell's equations through out my whole career. The equations that I did use were E=I*R, ohms law, P=I*E, watts law, Q=C*V, charge of a capacitor is the capacitance times the voltage on a capacitor, Q=I*T, charge of a capacitor is the current times the time of a capacitor and I*T=C*V. This leads to V= 1/C int(i dt), the voltage of on a capacitor is equal to 1/C times the integral of the current over time and I=C * dv/dt, the current out of a capacitor is equal to the change in voltage with respect to time. Yes, there are other common formulas like XC= 1/(2*pi*F*C) and XL=2*pi*F*L, to measure the capacitance and inductance reactance with frequency. We can't forget about T=RC, time constant of an capacitance-resistance circuit and T=L/R, time constant of an inductance-resistance circuit. Yes, I learned about Kirchhoff's law, Thevenin and Norton theorems too.
Yep, only the antenna guys have to deal with that nastiness. ;-)
Thanks for the collaboration! Thanks for expanding our understanding of Maxwell’s contributions!
My pleasure. Hope we can do it again. Thank you.
Both videos were fantastic and very well done. My only problem with yours and the History Guy's video is that you both left out Oliver Heaviside; the man who reduced Maxwell’s 25 (I think) equations to the 4 equations we know today (among other things). Oliver Heaviside truly does diverse to be remembered because he beat the theory into practical useful tools and techniques that could be used by engineers. If Tesla is everyone's favorite unknown scientific luminary, Then Oliver Heaviside is greatest electrical engineer that no one knows about.
Z
Kathy Zerkus - Thank you for your post. I just read the Wikipedia article about Heaviside, and his story is as fascinating as Maxwell's. I hope The History Guy and Arvin can collaborate on his life and contributions to physics as well.
yay THG!
I swear Maxwell is one of the most underrated scientists in popularity. He should be as famous as Newton or Einstein.
I can barely add, subtract or multiply and have zero understanding of equations, but I just LOVE this stuff.
As a physics chump I never knew I'd understand these concepts with such clarity. Thank you Arvin Ash for igniting this new fantastic experience in my understanding of physics especially electromagnetism, relativity and quantum mechanics. You are an academic treasure.
Imagine if we could go back in time and show these great minds the technology that their great works led to. I wonder what they would say about it.
They would kill us lol 😂😂
They would build a time machine, go back and kill theselves
@@rahul0754 underrated comment
"All that effort... All that work... All those late nights... and for what? Facebook and stupid cat videos???" *sigh*
all the realization and the rigorous work ....... which lead to this present of the internet internet era, which was preceded by millions of years of evolution ........ only to realize most of it all is cat videos and cringy tik toks.......and some of it actually being a blessing to many, in the form of videos like this........ and *cough* anime *cough* ............. only for me realizing i should be doing my homework........... amazing isnt it?
Every time Arvin Ash says"The explanation is coming up right now " I think: no way he can explain that in less than 10 min, not this time!Then magically it always ends with a mind orgasm. It is palpable how James Clerk Maxwell might have felt when realizing that the calculated speed matches the speed of light.Mind boggling is though how we still are struggling with wars,hunger and racism although humanity already was gifted with geniuses like Maxwell 170 years ago.
It is why I look forward to these. I am amazed at how much I have learned. Thank you.
The discoveries in Science are always the most thrilling events in History, Well, at least they should be.
I sometimes wonder how many geniuses has died because of wars throughout history. Maybe one of them would have revolutionize science knowledge just like Maxwell did with his equations.
The 'left brain' (a.k.a.: the intellect) does us no good for ending things like war and hate. Only the 'right brain' (where muh 'feels' reside) can do this. Science is decidedly bent (like everything in the known universe) to 'know' things. It does not like mystery. But the 'right brain' does, and that's where ideas of 'Utopia' come from. But the right brain is considered 'feminine', so for this reason, men, intellectuals, scientists and even religious leaders are decidedly 'masculine' (suppressed 'feels'). This is why science MUST merge with religion and 'spirituality' (same reason the man MUST merge with the woman).
BTW, Maxwell's 'addition' to Ampere's 'law' (Yang/masculine) was via his intuition (Yin/feminine): I.E.: "he just thought it up". So the 2 together are like matter/antimatter (and male/female) and have a powerful reaction (if they don't run away from each other). Just thought I'd point that out. Feel free to ask questions if any of this confuses (or annoys) you.
Thanks. I learned more in 13 minutes then in a semester of Fields and Waves when I was in college 25 years ago.
I hear you brother. Unless you luck out with a great prof., these things really don't get explained.
True. Too many dept. head profs teach from the textbook and do not encourage thinking / thought experiments / discussions.
I had 2 semesters of F&W and I certainly understand the subject better now.
If you used David Griffiths his book does do a good job at explaining alot of it, but this video is a great visual representation too.
@@brandonberisford The EM book honestly isn't that good.
Unlike most of the people commenting here, I’m not an engineer or have any connection with engineering, in fact I teach marketing at a university. So I have no background in engineering whatsoever, but the way you have explained this, even a layman like me understood it so well. You are a great teacher!
I woke up feeling big and then I watched this and now I feel super super small and can’t fathom with how intelligent these guys were. Great video as always Arvin.
This is superb. Maxwell has always been one of my favorites, but I’ve never understood how his mind made such a leap to see the relationship between electromagnetism & light. Your explanation Arvin is so clear and simple that now I feel like I truly have an intuitive understanding.
Love History Guy too! Good to see 2 of my favorite channels collaborating!
Sorry but this video is false and incorrect. You dont understand Maxwell if you think this video explains his theory.
Harry R.
So send me the link to YOUR video that explains Maxwell “correctly”, and I’d be happy to watch it.
As a qualified electrical and electronic engineer of 36 years in telecoms I have only just found out how radio propagation works from this video. WOW! At college and uni they did not explain it this well.
#John_King that is because most (though not all) professors with titles and letters after their names are educated above their intelligence. In other words, the don't understand the subject they are trying to teach.
Suddenly, electrical motors interfering with my WiFi makes sense!
I was at Warwick uni in the 70s and the professor just wrote Schrodingers equation on the board and said it was just a flash of inspiration that came out of the blue and no one really understood. Cop out central I thought...
Tailspin80 and my physics lecturer wrote that equation on the board and said solve it for homework!
MarcosElMalo2 Only if they have brushes - brushes are spark gap broadband transmitters.
Thanks dude, I love your Physics videos and I use them often in teaching high school Physics and Chemistry courses I teach!! I did my PhD Physics coursework at Purdue University with a 5.9 / 6.0 GPA but I greatly benefit from your videos, well done!!
Now I better understand why the electricity and magnetism fields in copper wires travel faster than the speed of light in free space or 3 X 10^8 m/s , because epsilon and mu in the copper are substantially different in copper than in free space and therefore the fields travel faster than the speed of light number we all have drilled into our heads from our school days!!
Great to hear! All the best in your teaching endeavors.
Are you saying electricity travels in copper wire faster than the speed of light ? Really !
@@Tholkaappiyam There is an upper limit to the speed of an object in a vacuum. But things can travel faster within certain substances, compared to the speed of light WITHIN that substrate. But nothing travels faster than light in a vacuum.
@@ArvinAsh Appreciate the reply and clarity in it 🙏🏼🙂
@@ArvinAsh Thanks I was going to reply with the same rationale as your answer!! Even well educated Physicists sometimes forget that the speed of light is medium dependent!!
Arvin, the world needs you and more people like you to help us make sense of things. I love watching your videos. Thank you
Bravo, probably the best visual explanation of the electric and magnetic constant that exist on the web. There's a huge shortage of these kind of videos online and you're doing great.
I propose that you make one of these visual explanations for each of the major physical constants. That would be awesome and teach very valuable knowledge to these curious people watching your videos.
Good suggestion! thank you.
@@ArvinAsh Thank you too. I do think your clip missed out on the honorable mention of Zeta nought that relates both the electric and magnetic constant to each other. Furthermore may I suggest The Fine Structure Constant and Von Klitzing's Constant as two possible future videos? :)
Was searching for somebody to explain this for 2 decades now.
"Why is the speed of light - what it is"
Speed of Light is a mythology.
and the answer provided is, because it is. maybe someday another bright guy will figure it out.
PhD here: Superb explanation!
I loved the way you expressed these concepts. Young students could get in love with physics with videos like this!
Im not even studying science now but while i was in the field. I never truly understood , light 'propagate' through space part. We study electromegnetism but never knew light propagate because the 2 field re create itself in a loop
Everything in the universe is connected magnetically!! The speed of light is directly proportional to the magnetic field and frequency of light your reviewing and the magnetic field it travels through. E=MC/2 has little to do with anything. Think about this, What is the speed of magnetism?? Every living thing and all matter are byproducts of magnetism. Tap the center of a bar magnet on anything and it will loose weight.
It has become my truth. I couldn't find that truth in the man made world. I have learned to reject human>>made concepts. Such as nothingness. The ultimate truth is the truth of the universe. I get a feeling of awe and wonder when I think about it. We are the universe observing itself. Or do I know nothing at all? It won't save me from death. But eternity in this form is not possible. A human mind cannot live forever. It's dust must become part of something else. My dust will live again in another form. Truly I am of the universe.
I'm more of philosopher than anything.
@@vincecox8376 *lose
@@Justice_Hammer , and what is the speed of magnetism, It's goes like this.
The height of ones intelligence is directly proportional to the realization of what you don't know..
This video is just pure genius. I really don’t know who Arvin Ash is - wether he is a teacher or a professor or “just” a superbly intelligent and curious human being - but I admire his lessons. What a great explanation this is… Thank you so much for sharing!!
If only I had these videos explaining these concepts 20 years back, maybe I would've been a physicist today. I loved theorems and derivations. They gave me joy.
Thank you for bringing that back to me.
I am humbled by your explanation. Thank you to the power of C.
I did elec eng 50 years ago and Maxwell's equations were a revelation to me then and still are now. The fact that all of E&M can be summarised in just 4 equations makes the subject the most concisely formulated in all of physics and science - I don't think there any other area that is so compactly expressed. Yes, one needs a lot of advanced calculus to understand and use the equations but that is true of many other areas, such as hydrodynamics and thermodynamics. I"d love a video on Oliver Heaviside next, please? He developed Maxwell's equations and the mathematics of the day (which was somewhat cumbersome) and produced a lot of the mathematical tools that elec engineers use now.
This video is misleading. You can not derive all of EM physics from just those four equations. Sorry wrong! The video is pseudo-science.
9:00 Marvellous explanation.
Thank you so much for this. I am old, but have wondered about things like this my entire life. Until now, my understanding ended with "Maxwell's equations said light went this speed". I feel like I know a little bit more about it now.
Some of us are gifted, you are clearly one of them Arvin. I never thought someone could make those concepts this easy to get!
So if You wanna travel with speed higher than light - You have to change the "resistance" of space.
Yep or find a substance with a lower barrier for electromagnetic waves - but this would probably only be true in another universe, not ours.
@@ArvinAsh frequency is effective
So space has lowest resistance in the whole universe... Bcz it is inversely proportional
If you travel at the speed of light anything behind gets red shifted to black. However everything in front gets blue shifted to the highest possible frequency and energy. You would be hit by gamma radiation from the direction of travel.
So is that the viscosity of dark matter??
People look up to Einstein, but Einstein looked up to Maxwell.
True ❤
Very true. Maxwell is underrated.
Tesla as well got high praise from Einstein
That was nicely done. Thanks for putting together a easy to follow path of how the speed of light is bounded by the interaction between electric field and magnetic fields.
Superb job. Maxwell also invented color photography by proving white light is made up of Red Green Blue colors. There's a picture of a bow tie of many colors he made in the 1860's. He was a full proffesor at 25 years old. What an incredible genious!
That was one of the most interesting talks I've ever listened too. I now understand something I have never understood before but always wondered about.
If only I was taught physics like Arvin does, oh my lost life! No matter then, I will savour the delightful insights of physics in my remaining late years.
VERY well done! I’ve wondered about that for years and even took time here and there to understand Maxwell’s eqn’s. You cleared it up in one brief video. Thank you sir. Subscribed.
Some of these scientist fellas are pretty darn smart.
I think the majority scientists are smart
PadorUmin , he was making a joke.
@@johnbattista9519 Shush there, I know
@@Kuumin i don't think you knew haha
@@SoulDelSol Shush there, I knew
This is absolutely amazing as it's the first time I've ever begun to feel like I partly understand what the four elegant equations actually mean!
Maxwell was a genius and might be better remembered today had he not died so young.
What an fantastic and incredibly well explained video ....now just binge watched about 20+ of your videos! Many thanks.
I love this channel!!
Everything in the universe is connected magnetically!! The speed of light is directly proportional to the magnetic field and frequency of light your reviewing and the magnetic field it travels through. E=MC/2 has little to do with anything. Think about this, What is the speed of magnetism?? Every living thing and all matter are byproducts of magnetism. Tap the center of a bar magnet on anything and it will loose weight.
I am a doctor and I just love physics..!! And this video answered my two basic questions - why the speed of light is constant in space time fabric and why EM waves move and are not stationary when there is no energy to propagate them..!! It is midnight right now and I am sleepless due to excitement of knowing these concepts ..!! 😍😍Thanks for brilliant video...🙏
Everything in the universe is connected magnetically!! The speed of light is directly proportional to the magnetic field and frequency of light your reviewing and the magnetic field it travels through. E=MC/2 has little to do with anything. Think about this, What is the speed of magnetism?? Every living thing and all matter are byproducts of magnetism. Tap the center of a bar magnet on anything and it will loose weight.
We should be learning this right after Neuton's Laws, what the hell, this took me almost 20 years to figure out "why is the light also electromagnetism and vice-versa"
Newton's*
Except you would also need to learn vector calculus to understand concepts like curl,divergence, partial differential equations etc.
What I remember after the high school Physics class: Maxwell was some guy who came up with 4 equations in physics (something something electricity & magnetism).
What I will always remember after watching this: Maxwell came up with the insight that light is an electromagnetic wave.
Cool stuff. He imagined a bouncing electric charge on a pole which creates a magnetic field, which creates more electric charges and more electric fields - an infinite loop of electricity and magnetism - i.e: a wave, a continuous super fast and seemingly never-ending wave - LIGHT.
Hi Arvin, your videos are amazing, really helpful in understanding complicated concepts in physics
Great job Arvin. If only all educators could explain as you do; lucid but without losing the profoundness of the idea, the world of learning would be a much more interesting place.
11:03 Goosebumps😢
It is unbelievable the great Scientists, Engineers and Inventors that have come out of that small country Scotland. Mindblowing.
Thank you for explaining this so beautifully. I never knew of Maxwell's thought experiment and it makes so much sense now that I understood that.
This is the most brilliant explanation I've seen. And I've seen literally hundreds, on TH-cam, lectures, as an undergrad, as an engineer..wow.
I struggled in my college days understanding this, and in few minutes you just explained it that would take whole semester
As an Electronics engineer we were taught Norton, Thevenin, Wheatstone but never really got much on Maxwell other than Maxwell's circulating currents mentioned but resolving them using simultaneous equations using Super Position. Learnt decades later that Super position is Quantum which is not the magic people would have you believe.
th-cam.com/users/shortsgwTmITmB7Vs?feature=share my page e=mc2...here i proved experimentally that time travel is possible.
I've watched many videos about light and maxwell equations and this is by far the best one. Well done!
Quality content 🤯
You explained these concepts so wonderfully in this just 13 minute video ..thank you for all your effort..
❤️❤️❤️❤️❤️
This channel is so Unbelievably Underrated, its annoying. Thanks Arvin Ash for the mind blown towards the end
Thousands of physics videos on TH-cam. I HAVE NEVER HEARD THESE SPECIFIC EXPLANATIONS IN ANY OTHER VIDEOS ANYWHERE ELSE ON TH-cam OR THE INTERNET!! This is AMAZING! I thought (wrongly) that I had "heard it all a billion times before" about physics. Not so. Thank you!!
I was astounded to see the velocity equation. This was a eureka moment for me, and seeing the mathematical derivation for the speed of light for the first time was a beautiful moment. Thanks for a wonderful video.
Glad it was helpful!
This is a brilliant exposition at the conceptual level before digging into the needed math. Congrats Arvin.
This 13 minute video taught me more than I tried to learn in a whole semester.
Yeah I agree, and that in itself is the scary point. I went thru this effect in opamps about two years ago, only learning more here by watch these kinds of vids. But crap, now that Im 66 years old kinda makes it all redundant.
I knew part of this but not all the details and as always Prof Arvin Ash ties all the lose ends together to make a very neat pack of history , Sir you are a rock of knowledge like no other , i plug your channel every chance i get for good reason you have the answers that most do not come up with , Thank you for what you do for physics now and in the future.
So smooth and articulated! Thank you for this nice video!
Thank you for your presentation. It's the best I've seen on the net pertaining to these equations and what they mean. Thanks again.
This is the BEST explanation of the speed of light I have ever heard and seen, THANK YOU Arvin Ash :-)
The best explanation of, well almost anything, that I've ever heard.
I love this guy. Best description I've ever heard of Maxwell's equations. I'm subscribing...You bring incredible value Arvin
Thank you. Welcome aboard!
@@ArvinAsh You're welcome Arvin. It's a delight to discover such value,,,such clarity. This speaks to the quality of the presenter. Cheers
this explanation tops every other one by a light-year-leap! You delivered knowledge without the "diva-blind" down. As simple as it truly is. Most deserved follow and like ever given! thank you!
I needed this
Edit: I am finally satisfied and I cannot thank you enough, Professor you are doing a great job
Now we have a better understanding of reality ty💞
I've never heard this explained before...absolutely fascinating. Thank you
You ease me with the maxwell equation and particulary with the meaning of the two constants.
The example of a guy swimming in the water is so great, thank you Arvin
The two constants are not explainable.
Thank you for sharing this informative video on Maxell' s equations. A remarkable simplified understanding of electro-magnetic waves. As a retired telecommunications technical officer in Telikom PNG Limited specializing in microwave radio, UHF, VHF, HF & solar power I must commend you for this video. Greetings from Madang, Papua New Guinea!
Arvin Ash does it again with the best explanation of Maxwell's laws. Keep this up man
That was fantastic. Thanks arvin.👍
That was absolute fantastic. Thank you.
I'm going straight to the History Guy channel now.👌
This is a great video. I'd watched many videos looking for this explanation and you explained it so clearly. Now I finally understand how maxwell equations inspired the theory of relativity. Thank you!
A truly wonderful amazingly simple explanation of essential factors we should all be aware of.
No one explained this to me in such an easy way like this guy, this channel is amazing
Absolutely amazing video, congratulations on your work putting it together and thank you so much for teaching me so much in such a short amount of time. Amazing.
You truly make us understand the Maxwell's equations in a very simple , easy and logical way. Thankyou so much, Now I love these equations.
This is the first time i've heard it explained this way or i'm finally starting to get it. Brilliant explanation.
Beware it is pseudo-science.
This is a great video! It's certainly not easy to decide which facts have to be included and which not. While the ideal would be, "To tell the whole truth and nothing but the truth.", the first requirement is impossible to meet, of course. Regarding the second one, there is a single point to complain about here: A changing field does not *cause* a curl in the other field but is *accompanied* by one, as Rosser already pointed out (W.G.V. Rosser: "Does the displacement current in empty space produce a magnetic field?", American Journal of Physics 44, 1221 (1976)).
While assuming a cause-effect relation, as most text books still do, does no harm to those who don't intend to seriously apply the Maxwell equations, it might scare off at first those who do (it did, at least to me, some decades ago) because it implies that you are dealing with a growing, uncountable set of fields! Additionally, it might obstruct the view on the real context: Fields are a form of energy, and the only known kind of flow of electromagnetic energy is described by the Poynting vector *S* = *E* x *H* . So, the spatial energy distribution of a field can change only in the presence of *both* fields.
This last point might go a bit beyond Maxwell's published ideas but I would be surprised to learn that Maxwell interpreted his curl equations as describing a causal relation of the form LHS = effect of RHS.
Yep, you described it more precisely. For the purposes of teaching the basic concepts to a general audience, I think it helps to visualize one event causing another. For physicists and electrical engineers, of course, a more precise description, as you have stated, is better.
Outstanding video! Thanks for the clear connection between Maxwell and Einstein! Very informative and fun!
Great job explaining the speed of light. It blows the mind to realize that the universe is like an ocean filled with uncountable waves of causality in every direction.
Fascinating explanation, given in a wonderfully intuitive way. Thanks. I've been looking at these equations for a long time as an engineer without really appreciating the significance of the achievement until now.
Wonderful! I know what you mean. Engineering profs rarely talk about the big picture.
Unfortunately, those of us who really understand the equations know that the video is false pseudo-science. Sorry it is mostly BS. You will get lost in mistakes if you believe it is correct.
@@harryr.6744 *"If you believe..?"*
Here we go again, *"... another not so innovative way a belief system trying to raise its ugly head yet again to interfere with, yet again, in trying to debunk a solid time tested scientific theory; UGGHHHH!!!!!"* Let's hear your logical or intuitive explanations that doesn't waste our time with baseless belief systems.
Oy, wish my EE/Physics professors could have simplified the overarching concepts to begin with as you have done...bravo!
Very well done! Excellent explainations! Love the collaboration with history guy too! Yay!
Not less than WONDERFUL! Wow. Your Energy Level- you are making Physics a lot easier to visualize. Please keep making more videos like this one :-)
These constants are like the configuration of the universe, tempting me to learn more about cosmology.
I remember a lesson from high school where my teacher described a visualization of electron flow in a wire as like a pipe full of ping pong balls to represent the electrons in a wire. When you push another ping ball in (applied voltage), a ping pong ball pops out immediately. The individual balls don't need to travel the full length of the pipe before they flow out the other end. The flow happens instantaneously even if the speed of the individual ball travel is slow. This is the speed of causality.
That's true, but the flow of individual electrons does become important when you're talking about semiconductors. Transistors, processors, graphics cards, etc. en.wikipedia.org/wiki/Electron_mobility
Yes, except there is a difference between when having gaps between the ping pong balls (instantaneous) and having no gaps ( not instantaneous). There are gaps between electrons - but do they need to make physical contact to create electron flow?
@@ac290741 there will always be a gap. Matter has space between atoms.
Moving electrons creates electric current that can be very very slow. However the moving electrons create electro magnetic waves that propagate with the speed of light. So television signals can be sent down a copper wire at the speed of light with almost no electric current.
@@hamidsharifi8295 - Electromagnetic propagation down a wire is different speed than electromagnetic wave through a vacuum or through the atmosphere for that matter. Each medium has a different permeability and dielectric constant.
Wow😲 greatest electromagnetic wave explanation on youtube
I can't get enough of this video. Well done all round.
This is one of the best productions I've seen!
Fenomenal
I watch a lot of content on TH-cam and it is extremely rare that I will give a thumbs up to a video. But this video got one without hesitation. I applaud this explanation. Just wow!
Thanks my friend. Glad you found it helpful.
This was truly a most enlightening video. My understanding of light as an electromagnetic wave is much broader.
So finally I understand the why behind the speed of light! Thank You , Arvin!
This is such a great explanation. I can't thank you enough.
Glad it was helpful!
Finally someone clearly explains why the speed of light is what it is, I suspect many things will now fall into place for me. Thank you 😊
No he didnt. It is nonsense. Sorry!
There are two parameters (Uo and Eo) that are measured and no one knows why they are what they are and why. They used to think there was a thing called the aether: a theoretical universal substance believed during the 19th century to act as the medium for transmission of electromagnetic waves and it is this "substance" is what is regulating light speed. There has been experiments to try and detect this aether but have failed to detect it. Maybe it has to do with space-time that Einstein talks about. I really don't know either.
Everything in the universe is connected magnetically!! The speed of light is directly proportional to the magnetic field and frequency of light your reviewing and the magnetic field it travels through. E=MC/2 has little to do with anything. Think about this, What is the speed of magnetism?? Every living thing and all matter are byproducts of magnetism. Tap the center of a bar magnet on anything and it will loose weight.
The most brilliant explanation of Maxwell's equations, I've seen so far!
What a great video!!
Thx for giving me these insights!