Magnetic Field of a Wire
ฝัง
- เผยแพร่เมื่อ 10 ก.ค. 2024
- 032 - Magnetic Field of a Wire
In this video Paul Andersen explains how current moving through a wire will generate a magnetic field tangent to the wire. As the current increases the magnetic field will increase and as the radius from the wire increase the magnitude of the field will decrease. When the current in parallel wires travels in the same direction the wires will experience a force pulling them together.
Do you speak another language? Help me translate my videos:
www.bozemanscience.com/transla...
Music Attribution
Title: String Theory
Artist: Herman Jolly
sunsetvalley.bandcamp.com/trac...
All of the images are licensed under creative commons and public domain licensing:
File:Electromagnetism.png, n.d. commons.wikimedia.org/wiki/Fil....
"File:Hans Christian Ørsted Som Ung.jpg." Wikipedia, the Free Encyclopedia. Accessed May 28, 2014. en.wikipedia.org/wiki/File:Han....
"File:Magnet0873.png." Wikipedia, the Free Encyclopedia. Accessed May 18, 2014. en.wikipedia.org/wiki/File:Mag....
"File:Oersted Experiment.png." Wikipedia, the Free Encyclopedia. Accessed May 28, 2014. en.wikipedia.org/wiki/File:Oer....
Jfmelero. Right Hand Rule Is a Physics Principle Applied to Electric Current Passing through a Straight Wire, Resulting in a Magnetic Field. The Thumb Points in the Direction of the Conventional Current (from Positive to Negative), and the Fingers in the Direction of the Magnetic Field., February 29, 2008. Own work. commons.wikimedia.org/wiki/Fil....
---. The Magnetic Field around Two Wires Carrying Current in Opposite Directions Cause the Wires to Feel a Mutual Repulsion., [object HTMLTableCellElement]. Own work. commons.wikimedia.org/wiki/Fil....
---. The Magnetic Field around Two Wires Carrying Current in the Same Direction, Cause the Wires to Feel a Mutual Attraction., February 28, 2008. Own work. commons.wikimedia.org/wiki/Fil....
watched you in 8th grade science classes, still learning from you as a sophomore in college. thanks for great vids!
Same
Does voltage in a wire effect the size of a magnetic or electrical field, thus effecting a parallel wire??
@@nathanieltalker6532 it effects strength of magnetic field as current effects voltage and vice versa
same
this is my favorite science youtuber. everything always makes sense. Thank you, bozeman science
2 pi r is the circumference, not area
These are the first things which I noticed
before deriving it's area. He's not wrong, but in the video it shows 2piR so yes, in that case it's wrong. d(piR^2)/dr = 2piR
what about all the correct things he said, can`t you maybe try to acknowledge that?
oh you beat me by 3 years LOL
lmfao
These videos are certainly some of the best explained science videos I've seen, keep it up. :-)
Thank you, you saved me!! The diagrams are very helpful to understand the directions of forces for parallel wires
Wow, you're videos are really good. I've always been searching for these type of videos with such excellent teaching.
Hi! Just saying you are a great teacher! I love learning from you! Specific and interesting to watch!
I love how you included the history of the discovery! It helps for some reason... :)
That's called the hook, grabbing students attention, making it interesting, making sense of why it is useful. People who have background in teaching and read education/teaching methods books know about this. This is why I like Mr. Anderson's videos so much. I dont just learn how to do it, but I also lean how and why it is useful
( :
You did great! I loved your visuals. I am 33 trying to figure where I am getting him from in my music studio. This helped me tremendously. Now it’s time to experiment and find how and why
Bozeman you are helping me big time!!! Thank you!!!
you're great teacher never seen before.. keep it up
Thank you very much. I couldn't find videos like this on TH-cam Italy. 😊👍🏻
Thank you! no one else it seems went over the relationship between electricity and magnetism. Kind of an important detail.
Super, clear-cut video!
Brilliant media and explanation!
it's a great explanation. Thanks Bozeman Science
Cheers Paul, I gotta teach this tomorrow and it has been a while.
Mr. Andersen.. what a surprise, I'm learning!
It has taken my professor 10 hours (5-2 hour classes) to explain what he has explained in 3 videos averaging 8 minutes each. 24 freaking minutes!
What is really needed is a video that shows the difference between wire sizes and number of turns on coils that would actually be used in motors and generators. With and without ferrite or steel cores. Driven as motor and non-driven as generator. Loosely and closely coupled. That would be very useful information to builders.
I have a diagram I would like to share with you. Coils coupled in such a way that most people would think they would cancel each other out. However they do not.
Amazing explanation sir. Cheers :)
You already speak English. Part of the image cannot be seen due to caption screening. But thank you very much for your work. It benefits.
Great explanation and use of graphics! Thank you so so much!!
you're an amazing teacher thanks!
great video!!!!!
made all my doubts clear!!!!
great video, thanks :D
I guess there is a point that you haven't discussed in this video: when you move a magnet inside a coil that leads to generating current but will any magnetic field be experienced with that? or will it be electrical field? will that field be experienced within the coil only or outside it as well?
thanks a lot!!!! from 5:40-7:30 is excellent!
Thanks for the content
Absolutely magnificent sir
Why all of these great teachers are on TH-cam 🥺 thank you ❣️ Sir
great explanation sir!!!!
hope u do a example for a coil next... will u be doing optics soon?
nice video and very thankful to understand about direction of feild but i have read that 2 pi r is the circumference of circle which is equal to length of conductor
So I am in the middle of this video when I start hearing weird noises around my home here in France.
apparently 2021 just happened ... anyway, resuming the video.
Thank you for helping me!
Thank you , easy to understand
That was really helpful thank you soooooooo much for that God bless you❤️❤️
it helped a lot. Thanks!
Thanks so much! I like your enthusiasm!
You're a G. I did not have a great understanding of the right hand rule, but now I do!
thank u i learned a lot
very helpful dude, ty!!
Great vid, thanks
Awesome man just awesome ...
thank u so much for the video
Thank you sir
Thanks Doctor!
Mr Anderson, to tell the direction of force acting on the blue wire due to the magnetic field of the green wire, we should use Flemming Left Hand Rule.
awesome sir helped a lot
OMG!!!!!!! That was amazing!!!!!!!
Thanks for stating conventional current convention. What happens if a single AC carrying wire is in the form of coil and magnets are passed across the coil, does it affect the current flow in the coiled wire?
Thank you Sir!
This is a great primer for the benzyl which was the experimental device described by project omicron, gravity control research. The only difference is the conductor is spun along its length, and at least four are arranged in a box configuration. This experiment hasn't been completed as yet and I hope somebody will one day give it a try.
Very helpful.
bless your soul
Thanks
now i understood it clearly
cool very helpful, didn't get the 2 pi r until just now, thanks!
It's not the area, it's the circumference.
YOU ARE THE BEST
Great lecture. Just thinking if you represent 1 to 4 fingers as such to demonstrate greater or lesser field strength, ie AMPERAGE. Overall to be excluded from using you pointer finger to demonstrate direction of FORCE
Right hand rule = conventional current flow
Left hand rule = electron current flow
Shouldn’t he use the left hand rule
@@KatherinePierce_81 no ... because he is talking about the conventional current (which is actually the flow of positive charges)
C_I_I thanks
@@c_i_i510 right hand rule is for induction, left hand for motoric effect
very very thank you
Thank a lot sir.
Superb. Superb. Superb.
thank you so much....
please explain the magnetic field due to a solenoid as well as a toroid
Thank you so much
Hi Professor. Could you please explain what a “Field” is?
Also, Why is “Magnetic propulsion” not used in almost everything requiring inertia? Thx. D.
Good explanation..
Why direction of current is taken as opposite of direction of electron flow ?
May you upload video on magnetic field direction in wire due to ac source(with animation video)
Great videos. I'm planning on studying Physics and Chemistry in a few weeks. Do you have any suggestions or recommend any Physics textbooks?
hope it worked out
Great video, but there's one thing: I'm pretty sure that mue-naught is 4(pi)*10^(-7)
Thx following u from Iraq❤️
So if you have a wire with current running through it theres an electric field around it. If you have just this setup, and no coil of wire around a nail or something like that to make what we usually call an electromagnet, can the magnetic fields just from the current in the wire itself be used to pick up paperclips etc?
do you have a video for magnetic field of a current loop?
Did you mean μR instead of μ0 ? Most relative permeability will be 1 in cases like copper and gold but is not the case with iron nickel and others. Is the equation using μ0 or μR? Major differences in values in material.
thank you!!
Beautiful
Explanation is marvellous..but circumference of circle is 2 pie r not the area..
hi , i wanted to ask why is it actually important to know the direction of the magnetic field ?
If you have two vortices of water next to each other spinning in the same direction, will they come together like two magnetic fields spinning in the same direction?
A tiny mistake,2πr is not the area of a circle(actually everybody knows that..).Anyway, I love this video.
Thank you good sir
nice one
Why is at 4:00 current going up but somehow magnetic field is pointed to the right? Kinda can't apply right hand rule here?
What will happen to a compass placed on the centre of these parallel wires both in same and opposite directions.?
At 7.32, your diagram shows field lines of the two wires crossing, which is not allowed! Any comments?
Hi Bozeman! Great video! However, your description is misleading. You explain the magnetic field generated by current, but you don't explain HOW the magnetic field is generated by current, which has to do with relativity.
+keyofawesomefan That's why it's called AP physic. You only learnt that concept at college physic 2.
+Js Cing lol i watched this video for help on a college physics 2 exam. what's wrong with making videos for people taking a class they care about, as opposed to making videos for kids taking a class so they can get into college? p.s. your arrogant comment is unnecessary, my arrogant comment is only in response to yours. sit down.
keyofawesomefan nothing wrong! Just saying he's not gonna cover college physic stuff in detail!
A mistake @5:24, 2pir is the circumference of a circle, area is pir^2 (pi r squared).
Youre a legend
**FORGOT ONE THING THOUGH**
*WHY* does the magnetic field rotate? Not a soul has ever answered this. Electrons flow in the wire; a bit of 'scattering' occurs as the flowing electrons bump into things in the wire (atoms, electrons). "And thus, logically, because of the random collisions of flowing electrons with the atoms etc. inside the wire, the magnetic field will ALWAYS circulate in the direction of the right hand rule."
There's no logic to it. The fact that electrons are moving through the wire gives (seemingly) NO CLUE as to why - with the randomness of the collisions in the wire from flowing electrons - why isn't the magnetic field around the wire ALSO randomly oriented?
I think if every physics teacher on the planet since, say, 1940 would have told students "we need you people to figure out why the magnetic field around a wire, when current flows in one direction - the magnetic field ALWAYS rotates the same way."
After nearly 80 years this would have been solved by now. Instead, no physics teacher I ever had wanted to tackle it or discuss it. "It's just one of those things you accept" NO. That's like the wife saying "my mother's moving in with us. It's just something you'll have to accept. She's your mother-in-law" NO.
The vast majority of us refuse to accept "accepted norms".
.
.
.
coz if u put a needle around a current carrying wire then the needle will deflect...and by varying the position of needle around it by keeping same distance from the centre of wire...u will see he needle gives same deflection around a certain area which is a circle...in that circle the deflection is same...bt different in other position except it...so for this reason the magnetic field is circle..and it moves circularly by giving equal deflection in it's locus points...
@@nafinmahmud6269 If you take a cross-section of the wire, the field is indeed a circle, I get that.
And if you looked at *ALL* the cross sections of the wire, the field would form a cylinder around the wire. I get that too.
But what I'm saying is this. Let's say you stand the wire up, vertically, from the floor to the ceiling, and look down from the topmost part of the wire. If the current was flowing from the floor upward to the ceiling, and you were looking down at the wire, you'd see the magnetic field was in a COUNTER-CLOCKWISE direction. Well, that's just per the right hand rule.
Now make current in the same wire flow in the opposite direction, from the floor to the ceiling. Now look downward from the top of the wire. You will see the magnetic field in a CLOCKWISE direction around the wire.
So my question was
1) Why does the magnetic field rotate AT ALL?
2) and Why does the magnetic field rotate COUNTER CLOCKWISE or CLOCKWISE, consistently, totally dependent on the direction of current flow.
I want to get at the *real, actual physical reason" as to WHY this happens.
I'm not the type to accept "well it just does* because this question has been glossed over for 150+ years.
It's time for an answer.
In physics, whenever you catch someone, an 'expert', telling you to accept something, THEREIN LIES an opportunity to discover something.
If we don't know the answer to these unanswered, puzzling mysteries, we will always be stuck in the current mess that is physics. For example:
1) "Why do 2 magnets attract each other across empty space?" ('they just do, invisible lines of flux and so on' - NO. Unacceptable.)
2) "What is gravity"? ('no one knows the answer but we can predict its behavior with Newton's laws and General Relativity' NO. Unacceptable.)
3) "What causes inertia, the *actual physical mechanism* ?" ('no one knows, it's just a property of mass' NO. Unacceptable.)
We have got to stop being lazy and get these answers. There are PROFOUND breakthroughs waiting behind the answers to these questions.
.
.
.
@Greg Chase how about this, Scalar Dimensional Relativity. it's special and it includes time becoming variable. and here in a moment, once we get a mutual understanding of what pictures are in our heads, this might explain why there is a rotation to a magnetic field, and why so many other things are right handed, physically speaking. you are still spinning the same way you were before you got to the inside of the bubble. our universe, what we observe, or what we are relative to, has a limit, a boundary. inside the boundary we observe 3 dimensions of time and space, each dimension just being a separate relationship between you, space, and time.. the observer interprets a space because of a relative difference in time it takes to observe two points. at the limits of our perception are the quantum and dark energy, then there is us, the observer. we can see that which is around us through observation and also conceive of infinity and what we are through our mind's eye, we are connected to the infinite also. this is gonna be a mind bender, for most, a total change in the understanding of "what are we?" and, "what is the meaning of the universe?" in bound.. spoiler alert! if nothing is infinite, then something must be, which becomes everything! this means that nothing really matters, hahaha, and that information is expanding infinitely, and that means that as soon as a time wave starts you get all math built right into the infinite structure that any finite time and space are built upon. and this means that you are an observer, a very special part of infinity that gets to receive information but also create and expand information as we translate infinity. this time around we get to look at ourselves through a 3d filter. like being in a submarine and being able to see what's just on the outside of your bubble, we are a fountain-like feedback loop of information being created, and creating through observing infinity, and currently you are observing this time and space, you are an observer in a four part system that flows infinitely; nothing - something - everything; infinity - observer - time - space - .... (side note: turns out, information expanding infinitely is something we perceive as love.. so there actually is only love, and we get to choose to observe it. If you actively choose to observe the truth, you let what's around you in; love, understanding, wisdom, kindness. If we are taught everything we know, and If we ignore the truth that there is only infinite expanding information, and that we are a part of it, and that we are observing ourselves, that we are creating ourselves, and that love is what information being created is... if you ignore love, you create fear, anger, hate, suffering. with love there is only understanding, wisdom, generosity.) back to describing multidimensional physics with words, Each dimension scales to fit what the observer would be relative to, total probability, total potential energy relative to observer... sooo at the moment you begin your observation, like when you go from observing some non-3dtimespace right before you become consciously aware before birth, even if you don't have spatial depth recognition yet, just that first moment of your soul squeezing out into a 3d bubble of look at this!, that's when the math happens and the total potential probability collapses into a Mandelbrot set like fractal of what can and can't be. this process, of a 3d timebubble (our universe in this case) be created as an act of virtually observing the surface of an infinite timewave, determines how this universe on the scale of relativistic magnetism will spiral depending on what the time wave was doing around it at the point of creation. so, imagine a bubble going with the stream inside a river of water, you are a super-frictionless bead of water on the inside of the bubble and you can see yourself as you once were but you can only define what you are now. you are still spinning the same way you were before you got to the inside of the bubble, and so is everything else that is in the bubble including the surface of the bubble, because everything was made at the same time by the same process, a process that involves the spin of everything being determined by the spin of what created it... Anyway, what's outside the bubble, can be spiraling like any point in a Mandelbrot fractal deep zoom, we are inside a scalar dimensionally relative bubble looking out at the surface of the time wave. just like ocean bacteria made organs, then scaled up to another dimensional relativity and evolved through adaption and the expansion of information- a collection of organs with all new senses able to expand information more, all so they could have on-land submarines called humans and observe an expanding wave of information beyond the limits of their previous understanding... as above so below... we too are part of whatever organism is made of a collection of souls that exists observing the next dimensions of time and space.. yeehaa, what stone age authority was that? i'm sorry, you're ruining the zioniosteconomic power structure with that talk bub... so, to make all that real simple... if magnetism is a force that is relativistic in nature, then the act of observing it, even virtually, ultimately is one of the integral components of its existence. So which way the observer spins, determines what direction the electromagnetic field spins. the observer being the universe, which in effect is you. So i'm saying that this place we call our universe, the whole thing has an intrinsic spin, only observable through a "we are seeing relativistic properties" filter such as a magnetic field, a universal force that is rotating counter to what produced it, like polarity spins a compass. so there's infinite time wave outside our bubble, the bubble inside is pinched at two ends with quantum strangeness at one end and dark energy at the other end and a third pinch that is a bubble inside the bubble, your mind. the edge where time becomes variable is quantum communication and is in microtubules that are in our neurons and were in tree cells long before that, it's all an observer, bub, a symbiotic organism that exists as a structure of information expanding infinitely through scalar dimensional relativity. at the infinite moment of creation, when nothing observes itself and something happens, the collapse of infinite to finite has the same relationship that an observer viewing a mandlebrot set deep zoom sees, at any given point in the math function an observer can begin a new everything... and at that point the math has a direction of spiral. so the bubble of observation spins relative to what is around it. the finite universe spins relative to the infinite time wave.
@@bobdole9708 Not a relativity fan. Relativity is like seeing something then asking someone "hey, did you see what I saw?' and the other person always says "No, I saw something different."
If you have to resort to a non-primary observer to confirm something you personally witnessed and are 100% certain you saw what you think you saw -- you're working too hard.
The fact is, I don't care what anyone else sees. If the magnetic field is working for me in my lab, and someone drives by and shouts "you're not seeing what you CLAIM to see" I'm getting pissed at the guy.
"Did I ask for your opinion?" I'd say. "I'm doing a freaking experiment here. If you want in, park the car and come check it out. Otherwise, myob."
Type of deal.
Einstein could not even get inertia and gravity right. OR IF HE DID, he didn't let on. Otherwise we'd have anti-gravity and anti-inertia devices by now.
Electromagnetism is verifiable by working, functional man-made machines that can be tested in the lab.
We have no:
1) gravity amplifiers
2) anti-gravity devices
3) inertia modification devices
that can be lab tested. If GR was fully correct we'd have had machines by now.
That's one way to instantly know if a theoretical physicist is bullshitting. "Okay show me the device you used in your lab that demonstrates your idea, show me a patent."
Einstein could not. WHY? Because General Relativity **IS A MATHEMATICAL DESCRIPTION OF SYMPTOMS**. The symptoms of gravity.
NOT how to increase it with a machine.
NOT how to decrease it with a machine.
"We know what gravity is, we have GR" no freaking way. GR and Newton ONLY DESCRIBE THE SYMPTOMS.
Not the HOW. Not "HERE IS THE EXACT, REPRODUCIBLE WITH HUMAN MADE TECHNOLOGY, PHYSICAL NATURE OF GRAVITY AND INERTIA."
Only descriptions.
.
.
.
Not a fan of relativity. Fun for Ph.Ds. Not fun for device makers.
.
.
.
.
.
.
@Greg Chase not being a fan, and not understanding yet, s'allright by me. I read Einstein for beginners at 7 and still don't understand why I haven't seen anyone make an enveloped microwave laser charged electromagnetic coanda effect, let alone a onboard fission powered reverse field pinch generator capable of lift and propulsion. It's not you viewing an electron flow or magnetism that makes a difference, it's what information the electron has available to it. Total potential energy must balance, and the difference between what the electrons on the surface see versus what the electrons that are an inverse square law going away from the conductor distance allows the electrons to see- gives us relative fields of information balance, charge balance, and thus magnetism... magnetism does not exist without information flow. the information in an electron flow is mostly charge, but I don't know, that's for experimenters to "diagnose". I do know, the more flow of electrons across a conductor the more magnetism you get, and if the earth is a five pole spinning hexagon magnet then you can make tectonic plates, earthquakes, volcanoes, and weather all with ionic charge balance. I am as frustrated as you are that there is not a functional man-made device available to the public capable of sustaining magnetic fields in a more controllable environment. the sun is a bit far away to touch, and plasma field generators are all being used as guns to smash things, making fields around a spinning sphere would be neat to test on, bose-Einstein condensates and plasma barriers have much in common, one hot one cold though somehow meeting in a similar place and time. we do have a few plasma barrier tests ongoing. plasma barrier discharge can even fly a plane. some plasm barrier experiments have exhibited a near super-frictionless heat state between the barriers, that's an indication of a quantum limit, if this universe has a relativity limit, then super-frictionless anything would be a good indicator of information crossing that barrier. meh, you stop seeing the light when you turn off the flow of electrons, magnetism disappears when then electrons aren't communicating, and heat disappears when spacetime isn't receiving information about electrons... as above so below. if nothing is infinite, then something must be, which becomes everything. i'm still not a fan, but the charbroiled hamburger I was imagining and wanted- did, without any further action than thought alone, did show up at my house thanks to a friend. coincidence maybe, or infinity existing and the transition into a non-infinite state through an act of information transition through observation called relativity might, at least, add some experimental thesis fodder to the world, add meaning to "life is what you make it", and, "life is but a dream", and the song "nothing really matters". maybe some of that can be quantified by device and experimented on someday after 1913, never too late to start a second type II civilization right?...
OK, a lot of research is available for the norm, which is North to South pull or repellent magnetic field. but, what happen to the magnetic fields with an unconventional series of magnet forced in position with a North-to-North onto the next a South-to-south so forth ten folds -- Q: Does one create a one greater magnetic field around the unit?
2Pi(r) is not area, but it's parameter.
perimeter*
From life experience yr comment tells me something Prateek. Only dumb ppl actually call someone a dumb. U do realize ur acting clueless cuz circumference is actually the same thing as perimeter, but only for geometric shapes with a loop.
4:42 - I see in the picture that the electrons are flowing from positive to negative. Is the image using conventional current flow as an example? I was always taught electrons go from negative to positive.
+Cliff Trainor - As Mr. Andersen's mentioned, it's the conventional current - the old fashioned view of moving protons originating in 1750 - that flows from positive terminal to negative terminal. Since the diagram looked archaic, it makes sense that the picture would have depicted conventional current rather than the current about which you were taught: electron flow from negative to positive terminals (the discovery of electrons was in 1897).
2 pr is not area...if am not wrong it should be circumference🤔
at 6.27, RH rule is force=thumb, field is first finger and current is center finger - so what rule are you using?
i had the same question
The left hand rule should be implied? because there is no induction in the blue wire..there is current going in the both wire at the same time?
The area in this case is calculated from raduis of magnetic field turns, I think it's radius of the wire not of the loop of magnetic field.
Very interesting presentation......takes me back to school. One thing I have a concern over is the general statement of "wire"....as it would be generally assumed to be a copper wire......BUT as a point of distinction Copper is not magnetic as not being ferrous.......BUT BUT BUT what if the wire happened to be a ferrous alloy....and the magnetic field. How would the ferrous magnetic property of such a wire act and affect the magnetic field ??? The point is to contrast ferrous VS non-ferrous in terms of the conductor IE "wire" in the performance and effect of the magnetic field being created.....and how that would influence applications in Electronics
Isn't the magnetic field a relativistic effect of moving charges ? ( I have read this explanation somewhere ).
If yes could you explain (with the relativistic effect) why the "polarity" of a wire change when te current change direction ?
Thx :) and sorry for my english xD