Motional EMF and Application of Faraday's Law
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- Опубликовано: 23 мар 2010
- Introduces the physics of motional emf which is an application of Faraday's Law. This is at the AP Physics level.
For a complete index of these videos visit www.apphysicslectures.com . 
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"You gotta believe" that brought a tear to my eye :*)
Wow, so many good things in this video. When you said 'how do we find ds/dt?' and that just turned into velocity, I was just like :O
And what was that??..! I wanted to learn about solar system and you taught me the entire UNIVERSE! Thanks Champ! Keep Posting :) :D
Much better explanation than my textbook.
Your videos have illuminated several aspects of the physical world for me sir! You are a phenomenal teacher.
This is incredibly useful. Thank you!
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I didn't expect an indian here . Honestly lol
wow..how you derived it made so much sense
I thought to learn a little bit about generators....but I got hook !!! Wow very good presentation sir !!!! Keep the good work !!! Saludos desde Puerto Rico !!!
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loving every minute of it
God! Our text need to have link of this vedio. Absolutely it is stunning. Thankfully I found on night of physics paper.
Great explanation. Thank you.
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Very helpful. Thank you!
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Very helpful video. But the presentation style of the toroid video is better.
This video is gold
what about work done to push the rod some distance to the right? just F times distance?
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At 4.00, shouldn't s be expressed as v.t ? as the distance s is increasing due to the velocity of the bar? In what cases should we use instantaneous distances and in what cases should we plug s= s0 + v.t ?
My textbook… almost every university textbook said that the motional emf=Blv not negative Blv. Your derivative makes sense but I’m confused for how inconsistent the equations are.
Are you representing the induced motional emf or motions emf? I hope you read this to clarify my confusion.
why is it -Blv? in class we had +Blv, does it have to do with the direction of the magnetic field?
The negative is because it applies lenzes law
minus determines the direction of emf. You can find it using common sense or with the help of the negative sign
is this related to relativity? and the fact that moving objects tend to talk up more space when they are moving than when they are at rest
sir lasseviren1 , since the current was initially derived to be negative, should the current at around 8:00 be negative as well? thank you!
I did not understand much from my electromagnetics class when I was in college and it is only now through your videos that I understand the subject. thank you so much for your videos! :)
Super late reply, but hopefully this can help other who see this comment with a similar question. Yes the negative should be carried over, this should also make conceptual sense since it is in the "negative direction" albeit arbitrary but since "v" is positive and rightward it hence implies the other direction is negative. Therefore, yes the force should be negative, however he did not seem to take into account the vector properties of force so he was likely solely solving for magnitude of the force.
I actually was hopping to see the general form of motion.emf
what kind of s is that ? I appreciate your videos extremely.
This was placed Ina. Uniform magnetic field that is coming ou to fit eboard right?
FINALLY SOMEONE HAS EXPLAINED WHAT IT MEANS TO "BRING BACK THE FLUX"
IN SUMMARY - IF THE B FIELD IS PRODUCING X (INTO THE PAGE) INSIDE THE LOOP YOU GET DOTS (OUT OF THE PAGE)
Now if you could beam that down with gps. We’d both be happy. Lol
i got it,thanks sir
believe! (in getting a better grade in physics)
Hi....awesome job....i jst wanted to ask why have u taken angle b/w area vector and mag. field 0 and not 180 since mag. field is directed inward and dir. of area vector is taken to be normal outward...plz explain
When the area is open area vector can be taken both sides as per convinience
excellent......
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does emf depends on cross section
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Thanks sir ji
The emf is due to the motion of the slider through the magnetic field and is not due to the changing flux linking the loop. Faraday's Law states just the opposite and is therefore not a law but just math. It is a case of correlation, not causation.
Sir l like to thank you so much you are owsom
can u explain how to find polarity of that induced emf on that wire
subham king where emf points is higher voltage
Thx.
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Why is N=1 tho?
1 loop
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Hey did you succeed? I'm doing the same
@William Han Sort of. I didn't succeed on the goal of getting a 5 on both; I got a 5 on Mechanics and a 4 on E&M due to some stupid errors. But all in all, I did succeed because I am getting credit for both at my university and I am happy with that.
@William Han Thanks! These videos are really helpful, just watch all of them and make sure to do some practice tests, and you should be good. The test isn't that hard if you know all the concepts but the time pressure on the multiple choice was kinda tricky at least for me so make sure to do plenty of practice! Good luck on your AP Exam and I hope you do really well!
F=I LxB =I L B sin(theta). in this case theta is 90 degrees so sin(90)= 1. that's why F= I L B
Current counterclockwise 1:33 why
Openstax Ch 13-14
I am using "conventional current" as the flow of positive charges. If you are using current as the flow of electrons, which it actually is, then electrons travel around the circuit in a clockwise direction. If we use conventional current then the right-hand rule would indicate the forces on the positive charges are upward in the moving bar.
I think You have made a mistake with the direction of the current as it was pointing inside so it is supposed to go clockwise .. Right hand rule .. lasseviren1
+noorr The direction of the current is determined by the direction of the induced magnetic field, and because B is increasing into the page, the induced magnetic field would oppose this.. out of the page. The right hand rule of this induced field would then determine current.
+S. M. Price Oh okay , i honestly forgot about this topic lol , thank you anyways sir.
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there is also this other guy that's really great w/ the pony tail