I have never got such an involving lecture on Electromagnetics. You know, even the professors of MIT could learn from you something in the teaching methods. I don't want to make someone upset, but before watching this video set, I didn't even imagined that there may be more talentive teacher on Physics than Walter Lewin, but this video set made me to think that actually there is.
1:37- dynamo effect vs. Motor effect 3:30- the motor effect tries to stop the dynamo effect/ lenz’s law* 7:37- the direction of current flow* 8:20- magnet passing through a coil of wire/ lenz’s law* 9:28- change in poles as the magnet leaves/ due to lenz’s law
Thank you sir. I wish my school teachers explained like you rather than just reading from a text book and telling us to do the summary questions after.
Hi Science Shorts, I did my A level exams quite a few months ago now. But I wanted to say thank you, your videos were extremely useful and informative and they helped me get my A in Physics. Thank you very much :)
People like him having only this such subscribers Shows us how much this world Sucks.. Im not a nerd and I hardly ever study so these videos help me a lot and its really shocking to see so little appreciation
8:41 If there will be a force caused by the magnetic field, it is opposite to the magnet weight but shouldn't be equal otherwise it will be held still.
This is really bringing me along now with my home made electromagnet and theory I need to know. Been told this in high school and college but this is great teaching. Thanks!
I've always used Stockholm Syndrome as an analogy for Lenz's Law .Basically, you want to break free but your captor doesn't want that to happen.However,once you attain freedom ,you incessantly pine for your captor's attention..
Only me And the Almighty knows how Youu made this topic a piece of cake for me. The Real Motor effect : with you being the "Motor" and Your Explanation being the "Effect". May God bring good to you.
Great educational video but one question I might have is when the magnet falls through the coil, how can the induced force (presumably upwards against gravity) be parallel to the magnetic field of the coil (also pointing downward at first) since the RHR says that they are at right angles?
Another way of remembering electromagnetic induction is thinking of it like the fire triangle, but instead of fuel, oxygen, and heat, it's: Force, Current, and Magnetic field. Cover your finger over one of the components, the other two make that one. E.g: Force is made by magnetism and current, current is made by force and magnetism
You are underrated. I have a question: what if the magnet enters with the South Pole? Will the entrance point of the coil carry the South Pole and the exit point carry the North Pole? That means the magnetic needle will show current upon entry in the clock wise direction and upon exit in the counter clock wise direction right? Please reply.
Hello. This is Mirza from Bangladesh. I had a question regarding the change of poles in the solenoid. Could you please tell me when and how do the poles in the solenoid change after the magnet enters it?
The magnet’s weight in the solenoid? What about the strenthgth of the field in the magnet? How does the weight affect or is the weight dictated by the strength of the magnet?
Frankie Gibson if it's a wire moving, then it's the Dynamo effect which then causes the Motor effect. Then if it's the current that's moving, it's the Motor effect that causes the Dynamo effect.
7:55 im trying to picture this using flemings left hand rule, which direction would i point the magnetic field and current? since i would think the force would be going up to support the weight of the magnet, unless it's being pushed to the side of the coil, and friction takes place? could you elaborate on this please?
I am confused with when to use actual current vs conventional. Am I right in thinking that when talking about free paticles(left hand Rule) focus on actual while for all other situations use conventional?
Ibraheem Patel Ur always using conventional but with free particles u have to work out which way conventional would be, so it be the opposite direction to the way a free electron would be travelling but the same direction as a proton.
Hi there,. Thanks for this video. You didn't finally show the direction of current induced. In the case above the current starts from north pole of solenoid and goes to the south pole of solenoid. Is that right? thanks again.
does the same thing happen if the magnet is dropped south first? like it forms a South Pole at the top and repels it and a north at the bottom and attracts?
if you run a current in a wire inside a magnetic filed, will there be an induced current in the opposite direction? or does len'z law only apply when you applied a force?
Lenz law was released in 1834, Fleming was born in 1859. I could not understand how Lenz discovered Fleming's rule ? everything else ties up well, Orsted observed compass deflection before Faraday, Electromagnet discovery, Lenz law all happened in chronological order except for Fleming's rule.
I’m a bit confused, if the dynamo effect tries the stop the motor effect, producing a force with a current that is opposite the direction of the original current, then how come there still is a current flowing?
it starts off accelerating under gravity, then as the magnetic force opposes it, the resultant force on the magnet decreases to 0. So its ACCELERATION decreases to 0, but its velocity is not decreasing, in fact it is increasing until the acceleration equals 0. At this point the velocity remains constant.
Yes so the magnet's velocity increases to a maximum, which is when the force induced by Lenz's law is equal to the magnet's weight, and continue to move at that terminal velocity, until it leaves the solenoid?
