Electromagnetic Induction, Dynamo Effect & Lenz's Law - A-level & GCSE Physics
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- เผยแพร่เมื่อ 30 ก.ค. 2024
- scienceshorts.net Please don't forget to leave a like if you found this helpful!
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00:00 Dynamo effect & Fleming's right hand rule
02:43 Lenz's law -
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Lenz's law is like going for a shower. At first you dont want to go in, but once you're in, you dont want to leave
Nice! :D
Would you please be able to make videos on the astrophysics? Would really appreciate it. Thanks :)
you got 2nd exam tomorrow?
Charlie Boxxh yeah
Good luck. I'm last minute cramming haha
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
The first minute of this video feels like a hand is talking to me.
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.
It’s now direction of an induced emf, current no longer gets the mark
You are LEGEN- wait for it - DARY !!!! Thanks a lot man... great stuff!!
Alaa Hamdan HIMYM💕
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 :)
Thanks man, u have successfully become the first person to make me understand the lenz law. The book and teacher failed to do so.
I can't describe how helpful these vids are at clearing up these concepts!! Thank you!
Great way to remember the differences between left and right hand rules, thank you.
great content and explanations! I finally understood all this! Thank you!
Great content, you are desperately underrated at the moment. Ill be sure to tell my friends about your videos. :)
Thanks! :D
J Dale do you go to Stowe
Maybe Mr Metson
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!
This explains Lenz's law so well. Thank you!!!
I used to get mixed up with the fleming's law before watching this!! Thanks!!
The best content provider of A level physics for free!!!
Thanks dude you explain everything really clearly :) much needed
Very well explained in a clear voice. Thanks
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
Brilliant videos, binge watching them atm, wish i found them earlier as they wouldve helped me so much
Josh Earlston I take it you are also panic revising for Paper 2 friday morning
Jeff Bob pretty much
Could you please explain eddy currents and how they form. Thanks!
This makes so much sense! Thank you🙏
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?
Thanks for all the videos they are literally saving my life QAQ
Thank you! Very useful examples and explanations :))
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.
Im sitting for my october exams, and im going thru all your physics videos. You are literally a life saver
No seriously, its astonoishing how you manage to teach me something in 20 minutes that my teachers struggle to teach in 2 weeks wow.
Same here. What exam board is it?
@@amanjaved3095 Edexcel ial!
Got my A LEVELS tomorrow!!!!!!
Good luck!
Hope it went well
@@efaz_1 got an A
God damn you are a wonderful human being, you may have just saved my a levels.
Thanks, but I'm really not mate; have a look at Jesus if you want to see a good person 😌
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?
Thank you for your teaching😊
with your direction of current using "N" and "S", surely that doesnt work if you wrap your wire a different way?
Amazing! Thank you. 😊😊
When the magnetic poles of the wire change does this change the direction of the current flowing through it?
Great video!
How do you determine the direction of the induced current i.e. induced positive and negative terminals?
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.
Really helps! Thanks!
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?
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.
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?
Just to clarify the current created at 8:04 is conventional current and flow of electron current?
Can't thank you enough! 🙏🏻
WONDERFUL VIDEO THANK YOU
tough stuff ! thanks for this vid
This was so helpful
just beautiful stuff
thank you
Cheers Pete!
QUESTION: why did you draw an ammeter in the last thing you were explaining?
Thanks your mate Pete
Wooow
The teachers are perfectly good
Do you have videos for O level physics? Or just A levels :(
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
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..
Lovely explanation
Put this in action, would be cool to see u using a motor/generator
Solid 10/10
thanks!!
Why do you have to use the right hand rule for the dynamo effect - in turn the left hand rule will be doing the same, No?
Thanks
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.
Cheers Pete
Is this how you get a.c current ?
Bruh youre awesome
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?
Yep! Back emf.
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?
Yep!
Does the current you referred to from the N and S letters represent conventional current or actual current flow?
Always conventional - we never think about electron movement in wires.
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?
Because it doesn't stop it completely.
0:50 I'll use this to remember that motor cars drive on the left.
How would a torus/donut Earth have its magnetic field like?
I finally understand it 😂
oh no....this is gonna be hard
If dynamo effect tries to stop the motor effect and vice versa then it means there is no actually force acting on the wire ???? Please help....
No force means no acceleration, but no acceleration doesn't mean no velocity
How do you know when to use the Dynamo effect before using the motor effect and visa versa
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.
jordan harris cheers
the current induced in the solenoid due to the magnet passing is a.c right?
No...
0:58 we also can say , steering wheel placed on the left ..... Sorry if that doesn't work for you because you in Britain
Theres a trend amongst science teachers to talk about things like theyre sentient
I love you so much
I'm surprised that we don't need to know how the motor effect works, or anything about the dynamo effect, for OCR a level
you've saved me
all my homies hate lenz's law
please make a video on eddy currents
No video necessary - they're just little whirlpools of current 👌
Hey could I just ask why velocity is constant if you said that the magnet eventually reaches terminal velocity? Doesn't it mean its decelerating?
Terminal velocity means that it is not accelerating or decelerating, the forces on it are balanced.
but it REACHES terminal velocity doesn't it? So mustn't it be decelerating to reach max velocity
Well no, it goes from accelerating to not accelerating. The acceleration decreases to 0 so the velocity is constant.
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?
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.
He absolutely destroyed that left hand sign worse than my teacher. Damn it 😅
Cheers pete
i luv you
Thanks Pete!
0_o
@@ScienceShorts haha
My brain feels broken
thanks pete
good luck for tomorrow everyone :)
Tommy wants that gum from aston
Has anybody told you that you sound like Thor?
Sound? No. Look? All the time.
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Science Shorts End game Thor or fit Thor?? 😂
@@JamesWilson-ui1wg :3 lol
Nah I think its more like Magnets and Wire are like a relationship in real life
this is way too hard for gcse
There are so many induendos in this video...