Thanx for ur comments. Actually I'm not a teacher by profession or any kind. I'm just a chemist by profession and making such videos is my hobby. Please pray for me such that I can make many more videos which may help students like you and all over the globe.
Regardless brilliant method of getting the number I have another thought about this experiment. This point 3:19 Fe=Fg, two forces of the same magnitude? Assuming the experiment is done in vacuum so we can simplify Fg to pure gravitational force acting against the electrical charge. Does it mean they are exactly the same? The only difference is we can adjust one of them. Properties are not important in this case. I can go even further. Fe=Fch=chemical charge of electrolyte in a battery. The same exactly force but in this case between separate atoms. This is being carried through conductors. Different material than electrolyte but still the same force between different atoms. Absolutely mind blowing experiment. While the drop is is levitating over a period of certain time work is being done and charge of the battery should be decreasing slowly. This means the density of the electrolyte will change. This is the only change over a time in properties of the material we observe in the experiment. Mind has been blown away once again.
The last comparison table was the missing concept that I was searching so far, which leads to the estimation of e, thanks a lot Soumitra Das. Good Job.
Correct me if I am wrong. But, I believe at 3:18, when the voltage supplied to the plates creates an electric field force that balances (stops oil drop motion) the oil drops, the guy has the gravitational force mixed up with the viscous force. At 3:18 it should be F(gravitational) = 4/3 * pi * r^3 * (rho - rho(air)) * g. Again, please correct me if I am wrong.
Matthew Dann Remember when electric field was not applied the oil drop was falling down with a velocity = v1. We have already mentioned there that the gravitational force is equal to 6*pi*eta* r*v1. So why cant we apply that when we apply electric field to stop the motion of the oil drop.
@@abdulmutlib1583 Oils are generally long chains of Fatty acids , Which are usually Negative charged. So it will attract to the +ve plate which ever that is.
It's is substituted with an earlier Expression to make final equation easier and in terms of Terminal velocity. What you said is also correct . Great Work man ,
Thank you for making this video it is excellent! I was having a hard time understanding how he calculated the charge of the electron, but I know understand!
Explain why you take v1 and v2 and adding up together? The drop will fall with relative velocity? Why is the body falling with two different velocity According to 1st equation -ve sign will come why not taking that?
Thank you sir , for the wonderful explanation but I was wondering how should I teach this to my younger brother about how did we get the charge on electron when he knows nothing about strokes law and stuff.? Please help me out ...!!!
At 4:05 , why does the oil drop move upwards with a constant velocity even though Fe = Fg + Fv. Should it not stop at a certain point if all resultant forces are balanced? Please explain Thankyou.
Fv will be there only when the body is in motion. If we say that the body is not moving i.e. it is stopped at a certain point, then at that point, Fe = Fg. Then as Fe gets greater than Fg, the body starts moving upwards and hence, drag force comes in the picture which is basically a force that a body experiences in the direction opposite to the direction of its motion.
In case 1, where the motion of the oil drop is stopped, wouldn't a force derived from the electrical field equal but opposite to the gravitational force simply result in a constant velocity (zero acceleration) rather than a situation where there is necessarily zero velocity?
This was great :) make more videos! I want to see how electrons are proven to exist and also how physicist know there is so much empty space in the atom please answer these troubling questions because I can't seem to find the answers anywhere
The picture, date of birth, and date of death are all for Robert Mulliken, a completely different person. I believe the year he did this was 1909, when he was 41 years old. The information in your video makes it appear that he was only 10 years old when he did this.
The x rays ionise the air particles around and the oil drops get negatively charged. A positive terminal is connected to the top plate,it attracts the oil drops, so the drop can remain suspended in air and not fall due to gravity.
Electrons get charged due to friction at atomiser (negatively) and when these collide with X rays,their charge decreases because X rays ionise the gas and negatively charged oil drops and positively charged ions attract each other.
Thank you for making this video it is excellent! I was having a hard time understanding how he calculated the charge of the electron, but I know understand! thanks
On second case, when the electric field is turned on , the force experienced by the oil drop (or electron) is F = qE which acts upwards and so does the viscous force , i.e. viscous force also acts upwards according to my reference materials but you stated that viscous force in second case acts downwards, please explain it. The final expression on my reference book is q = 6πηr(v1 - v2) x d _________________ V whereas yours is q = 6πηr(v1 + v2) x d _________________ V
![[LIVE] : ONE ลุมพินี 89 | คู่เอก "ยอดไอคิว vs คิริลล์"](http://i.ytimg.com/vi/Z3vYkHJ_5Ig/mqdefault.jpg)
that is some boss level thinking skills...we should take a moment to appreciate how cool that is ....like seriously
This is, like, the coolest thing ever. The math is so simple, and it teaches a lot. I'm proud of humanity.
Did not understand the math until the chart.
U are more of like a robot it’s a university level how can some one understand this simply 🧐🧐🧐🧐🧐😎😒😒😒😒😒😒😒😒😒😒
The thinking level of this experiment from the perspective of Millikan is just godly! amazing
Physics doesn’t get any better than this. Thanks Millikan . . .
Thank you for your teaching. You have students at tons of collegs all over the world learning from you. I'm at university in California.
Thanx for ur comments. Actually I'm not a teacher by profession or any kind. I'm just a chemist by profession and making such videos is my hobby. Please pray for me such that I can make many more videos which may help students like you and all over the globe.
UK physics A-levels here. Seriously thank you.
I don't think these r the topics to be taught in universities .its taught in class 11 in Indian schools bro
@@kartiksingh4082 people study this in university level for further studies mate. Indian ncert just showed the expirement.
Thanks for the video.
Many times I have a hard time understanding indian presenters but you speak very clearly.
I am from INDIA... the greatest country 😎
This is amazingly comprehensive. Thank you very much!
I checked out some TH-cam clips about the Millikan experiment. Yours is the best. I'm gonna use it in my teaching. Thank you.
I just couldn't avoid giving this video a like, it the calculations easy to visualize
Every point aptly covered with clear diagrams and professional tone
Regardless brilliant method of getting the number I have another thought about this experiment. This point 3:19 Fe=Fg, two forces of the same magnitude? Assuming the experiment is done in vacuum so we can simplify Fg to pure gravitational force acting against the electrical charge. Does it mean they are exactly the same? The only difference is we can adjust one of them. Properties are not important in this case. I can go even further. Fe=Fch=chemical charge of electrolyte in a battery. The same exactly force but in this case between separate atoms. This is being carried through conductors. Different material than electrolyte but still the same force between different atoms. Absolutely mind blowing experiment. While the drop is is levitating over a period of certain time work is being done and charge of the battery should be decreasing slowly. This means the density of the electrolyte will change. This is the only change over a time in properties of the material we observe in the experiment. Mind has been blown away once again.
The last comparison table was the missing concept that I was searching so far, which leads to the estimation of e, thanks a lot Soumitra Das. Good Job.
Correct me if I am wrong. But, I believe at 3:18, when the voltage supplied to the plates creates an electric field force that balances (stops oil drop motion) the oil drops, the guy has the gravitational force mixed up with the viscous force. At 3:18 it should be F(gravitational) = 4/3 * pi * r^3 * (rho - rho(air)) * g. Again, please correct me if I am wrong.
Matthew Dann Remember when electric field was not applied the oil drop was falling down with a velocity = v1. We have already mentioned there that the gravitational force is equal to 6*pi*eta* r*v1. So why cant we apply that when we apply electric field to stop the motion of the oil drop.
dear! if top plate connect with negatvive voltage what will be effect??
@@abdulmutlib1583 Oils are generally long chains of Fatty acids , Which are usually Negative charged.
So it will attract to the +ve plate which ever that is.
It's is substituted with an earlier Expression to make final equation easier and in terms of Terminal velocity.
What you said is also correct . Great Work man ,
@@soumitraa0 so what is the use of X ray source in this experiment ??
U haven't mentioned it ..
Thanks a lot much for removing my doubt in depth
Thank you so much sir...your way of teaching is amazing
This was very, very helpful Sir. Your vedio explains this way better than NCERT and most other reference books
Plz refer other books too
Thankyou so much this was helpful 😊😊
Claps for the teacher. He is awesome !👏👏👏👏👏👏👏👏👏👏
Thank you for making this video it is excellent! I was having a hard time understanding how he calculated the charge of the electron, but I know understand!
I've 25 videos on chemistry in the youtube. See all of them and leave ur comment
Thanks it is really very useful. Create such videos for many other experiments which would be very useful.
I couldnt find a better vdo for this experiment.. moreover your voice is amazing.. not all indians speak english this clearly..!!
Explain why you take v1 and v2 and adding up together?
The drop will fall with relative velocity?
Why is the body falling with two different velocity
According to 1st equation -ve sign will come why not taking that?
Thank you sir , for the wonderful explanation but I was wondering how should I teach this to my younger brother about how did we get the charge on electron when he knows nothing about strokes law and stuff.?
Please help me out ...!!!
Very good explanation sir! Thank you!🤗🤗🤗🤗🤗🤗🤗
It was exceedingly useful.. Thanks for the explanation.
Your animation video is understanding for concept in lesson. Many students very useful for us.so upload all lesson video for12th std physics.
Hi good video watching from dubai
At 4:05 , why does the oil drop move upwards with a constant velocity even though Fe = Fg + Fv. Should it not stop at a certain point if all resultant forces are balanced? Please explain
Thankyou.
Fv will be there only when the body is in motion.
If we say that the body is not moving i.e. it is stopped at a certain point, then at that point, Fe = Fg.
Then as Fe gets greater than Fg, the body starts moving upwards and hence, drag force comes in the picture which is basically a force that a body experiences in the direction opposite to the direction of its motion.
Hence, when the body is moving upwards, Fe= Fg+Fv
Thnk u so mich for this video it really helped me very mucchhh.....👍
Thanx for such good knowledge....what softwares do u use for these diagrams
Very nicely explained...It will help me...
This question I watched in 2017 and was asked in Oxfords test for 2020
Please tell me is the direction of E right in the video?
I'm in class 9th and studying 11th std portion and I had difficulty understanding it. But u made it so clear
Your school sucks coz not teaching 9 th but teaching 11 th
Great Video...Was Helpful...👍👍
Brilliant explanation .
Great explanation, thank you!
In case 1, where the motion of the oil drop is stopped, wouldn't a force derived from the electrical field equal but opposite to the gravitational force simply result in a constant velocity (zero acceleration) rather than a situation where there is necessarily zero velocity?
ste h think of both the first and second law of motion. not only the second law. hope u get ur answer
+Soumitra Das thanks for thes ved larinng by video
Good explanation sir.......!!is there an other method to calculate charge???
But ur english.... RIP
Thanks for the help
Excellent Explaination !! 👍🏻
pretty sure your polarities for the plates are wrong, but otherwise, pretty good.
sir when the oil drop is balanced between the two plates, what would be the nature of viscous force??
When velocity = 0 then viscous force will also be zero.
Very good explanation
Nice video easily explained easily understand
Thank you for the practical lesson. Very nice.
Very good explanation.Thank you.....
Which gas is present?
Coolest explanation 👍
This was great :) make more videos! I want to see how electrons are proven to exist and also how physicist know there is so much empty space in the atom please answer these troubling questions because I can't seem to find the answers anywhere
Read Rutherford's alpha particle scattering experiment
so no one noticed ? he discovered the chare of an electron when he was 10 years old
Millikan was born in 1868. Mulliken was born in 1896.
Your first slide suggests that Millikan was 10 years old when he conducted this experiment.....
Very Nice Explained
Thank You Teachers
is this chemistry or physics ?
Physics
chemistry is physics.
Amazing video sir but I think there's a mistake. The upper plate is of -ve charge rather than +ve that's why the Electric Field is upwards
I think it's correct
No, the upper plate is positively charged and lower plate is negatively charged
Lots of love from nepal ❣️😌😌😌😌❣️
very good vedio.understandable.thank u for including the formulas..
u like, i get my prize
thankz. very useful
The picture, date of birth, and date of death are all for Robert Mulliken, a completely different person. I believe the year he did this was 1909, when he was 41 years old. The information in your video makes it appear that he was only 10 years old when he did this.
Very helpful Thanks a lot from NZ
can you explain me why the +ve terminal of the battery is connected to the top plate
The x rays ionise the air particles around and the oil drops get negatively charged. A positive terminal is connected to the top plate,it attracts the oil drops, so the drop can remain suspended in air and not fall due to gravity.
I understood 60% but it is a gr8 vdo
Good. But you have skipped how the oil drop get the negative charge....
HE WAS BORN IN 1868 AND DIED IN 1953.HE PERFORMED HIS FAMOUS OIL DROP EXPERIMENT IN 1909
Not 1906 but in 1913 when milicon determine the aqurate charge value of electron, according to ncert book ..
way u teach is good and well open hence easy to understand u
if top plate connect with negatvive voltage what will be effect??
Then the plate will repel the drops and they will fall with a greater acceleration on the bottom plate.
Its very useful for me . Thanks to load it
Thanks very much ..👍👍👍
nice video cleared all my doubts
Nice video easily explained
What was the role of x-ray....?
To ionise the gas present inside.
can i know the how this animation is made?
nice explanation it helps me in class to remeber fast
so nice ,good animation
so nice ,good animation
Can we take another liquid in the place of oil
It should have viscosity
How to concentrate???😰😵🥴
Good explaination
it's good explanation of topic but formula derived here is quite different from the article. .....
Very nice e explanation
Nice idea to upload same video again...
It's very useful sir
Thank you soo much Sir 🙏
what is the purpose of x ray surface?
Nihaal Ayathan to charge the oil drop
To ionise the oil drop.
ionise in what, anion?
Electrons get charged due to friction at atomiser (negatively) and when these collide with X rays,their charge decreases because X rays ionise the gas and negatively charged oil drops and positively charged ions attract each other.
so simply discussed.nice
how can i download this video
How the oil drop falls down when no force acts on it. Gravity makes everything to fall...but without gravity how can it fall
The positive plate attracts the drops so they remain suspended
Now this the best confused 🤔 force (viscous and gravitation formula)
Thank you for making this video it is excellent! I was having a hard time understanding how he calculated the charge of the electron, but I know understand!
thanks
Wow.... some1 pls edit that mans face with a sunglass and pay respects with sunglass emoji
Thanks a lot 🙏🏼
Thank you. Very useful
Good video
I understood the best from this after trying hard
Thank you so much ❣️😌😌😌😌❣️
Good explanation but voice quality was not proper.
On second case, when the electric field is turned on , the force experienced by the oil drop (or electron) is F = qE which acts upwards and so does the viscous force , i.e. viscous force also acts upwards according to my reference materials but you stated that viscous force in second case acts downwards, please explain it.
The final expression on my reference book is
q = 6πηr(v1 - v2) x d
_________________
V
whereas yours is
q = 6πηr(v1 + v2) x d
_________________
V
Same question here !
viscous force is an opposing force like friction so it always act opposite to its motion,so as oil droplet moves up it act downwards !!!!
Fg is force of gravity and that equals Fv in first case thts why he noted Fg=6rv
If the oil drop fall down with a small terminal velocity v2 even though electric field is applied then only it is (v1-v2)
But how do we know e/m??
to find e/m we use the J.J Thompsons Experiment
th-cam.com/video/jTMeh-e5Y5M/w-d-xo.html this is the video it might be helpful
Thank U Sir good explanation Thanks a lot
Thank you. Everything well explained. Greetings from Poland :)
Your photograph of Millikan is wrong.
That is Mulliken who is the inventor of molecular orbital theory.
u r right, trying to mend it.