Physics 47 Inductance (1 of 20) Mutual Inductance Explained

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In this video I will explain mutual inductance.
Next video in series:
• Physics 47 Inductance...

[@acausedelle1547]

So this is what it's like to have a decent physics instructor...

[@dvictorious]

I second that!

[@thatowmoyo1075]

Still assisting us student to this day! Thank you so much!!

[@patmanahan9953]

Your videos are the best. You explain the concepts very well and very easy to understand.

[@crazyby00091]

Simply the best video tutorial for learning mutual inductance. Thanks a lot !!

[@valeriereid2337]

Listening a second time and everything is certainly clear. Thanks for keeping these lectures here. I appreciate all your lectures.

[@MichelvanBiezen]

Repetition is a very good method for learning. 🙂

[@BR549DBH]

You have done a very great job in explaining this subject. My professor in college just did spend enough time as you are here. Thank you so very much. I have watched many of your videos. I think I will start calling you uncle Michel. lol. Once again, great job.

[@OswaldChisala]

Another great video! Thank you for your perspective on the topic of mutual inductance. A fundamental understanding of this geometric property of a magnetodynamic system definitely lends a hand to students that are trying to really understand EM. Please keep up the amazing work, you're doing such a good thing for learners everywhere.

[@jakubkusmierczak695]

Mr. Professor You are the teacher of all 😊

[@MichelvanBiezen]

Thank you. Glad you like our videos.

[@jakubkusmierczak695]

@@MichelvanBiezen it improves my knowlede (now I know that transformer works thanks to mutual inductance not the electromagnetic induction).

[@mivapusa]

May the gods make this man fucking immortal, so future generations can benefit from his teachings

[@descalzarte1463]

Thank you so much for all these videos! I'm going over my notes from uni and couldn't understand anything... much clearer now :)

[@valeriereid2337]

I needed this thorough explanation. Thanks again for these awesome lectures!

[@MichelvanBiezen]

You're very welcome! 🙂

[@lucasresenderesende9840]

Professor ! Could you make one video on Z-transform. Your Tutorials have really helped me to achieve first class in EEE. Thank you !!!

[@dip-tree]

Most texts and explanations gloss over the M_12 = M_21 derivation. Since you were using calculus, it could have been shown as the paper doi: 10.1119/1.16941 does. Nonetheless a very useful presentation. Thanks.

[@MichelvanBiezen]

Thank for the input.

[@user-cr8xy7fr3x]

Perfect... U cleared my doubt

[@MichelvanBiezen]

Glad to hear that

[@jigarmodi7762]

I still have one question that what if I connect 2 coils in parallel and feed the current. Does it have the mutual inductance ? I know it should have because coil 1 flux will still link with the coil 2 and produces the emf which is either more or less than the emf produced by that coil (coil 2). Thanks a lot for clarification.

[@surendraparikh39]

Lots of love and respect to you from india

[@EagleLogic]

Hey Professor, I was watching your videos today to prepare for my next exam, and my girlfriend was wondering where you are from? It sounds like you have a slight accent and now I am curious as well. I can't quite pin point it! Thanks as always you are a huge help.

[@MichelvanBiezen]

I was born and raised in Belgium speaking Flemish.

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Thank you so much!

[@surendraparikh39]

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[@dinithilakna9846]

Good explanation

[@joeeeee256]

You are a brilliant teacher!!!

[@hiitsmicha]

Great video, as always!

[@MichelvanBiezen]

Glad you liked it.

[@user-vy1dy6ih8e]

Great

[@yoopata]

Straightforward lecture. Always learn a lot from your videos. Thanks a lot!

[@shinitshetty2744]

Can you make a video about Ruhmkroffs inductor coil???

[@krabbypatty3644]

I love your videos.

[@smittyflufferson1299]

Great lecture

[@MichelvanBiezen]

Glad it was helpful!

[@SaRa-vq7mk]

thank you

[@MichelvanBiezen]

You're welcome

[@mathieubuisson8873]

great explanation thanks

[@MichelvanBiezen]

Glad it was helpful!

[@veyisturgut6362]

[@asaadalalawi3561]

Greaaattt explanation and video !. But my question is when calculating EMF induced due to mutual inductance, what value of magnetic flux we should use to calculate mutual inductance (M). Just wondering since we have a changing current, which means we have a changing magnetic flux. and I really appreciate your videos!

[@MichelvanBiezen]

Yes, in order to be able to calculate the mutual inductance, you would need to know how much of the flux of one inductor is coupled with the other inductor. In the case of a transformer, it is almost 100% because a solid metal core links the two.

[@MrAhmed231]

for M 21 flux= B1 × Area of coil 2 right?

[@jamesvick8431]

Sounds like a transformer is two inductors

[@MichelvanBiezen]

+James Vick You are correct. They typically place a piece of iron (or multiple iron disks) through both inductors to increase the mutual inductance.

[@shamimshah1687]

If two concentric circular coils having different radii, one is smaller than the other and the coil (c2) having a larger radius is carrying a current I then what will be the current flowing through the second coil (c1) having a smaller radius? What happens if the same current passes through the coil c1?

[@MichelvanBiezen]

The amount of coupling does depend on the relative sizes and would be difficult to predict, and easier to measure. However there would only be current induced in the second coil if the current in the first coil is CHANGING. A steady state current in the first coil would not induce a current in the second coil.

[@diegoalvaradourrunaga4890]

Hello, first of all thanks for all your videos. What happens when one of the coils has a smaller radii and its magnetic field isn't uniform over the bigger coil?

[@MichelvanBiezen]

If one of the diameters is made smaller, then the mutual coupling would be reduced. The magnetic field does not need to be uniform in order to have magnetic coupling.

[@diegoalvaradourrunaga4890]

@@MichelvanBiezen Right, but considering they smaller one as a dipole, how exactly could I demonstrate they mutual coupling value. I know that the magnetic field from they outter coil would be uniform over the smaller one, but the magnetic field of the inner coil wouldnt be uniform over the bigger one and that makes dificult to calculate the flux over the bigger one. I hope i'm making myself clear. Thanks for answering : )

[@kemalaziz9696]

If the current in the first loop is constant, then isn't i2=0, and M12 undefined?

[@MichelvanBiezen]

Correct. There is only mutual inductance if the current changes in one of the loops.

[@slipnorris5882]

good teacher

[@minatoxxpr]

thanks you made things more clear. Take care! o/

[@lilitv9723]

OMGGG THNXX A LOT

[@AAASSS-su9gy]

will the second coil affect the first one by producing on it an opposite magnetic field as for every action there is a reaction equal in magnitude and opposite in direction?

[@MichelvanBiezen]

You are citing Newton's 3rd law which refers to forces. However you are correct in saying the with the interaction between charges and magnetic fields, there is a similar interaction as well. The mutual induction between coils tends to be the same.

[@AAASSS-su9gy]

Michel van Biezen and will that increase the current of the first coil to oppose this change?

[@MichelvanBiezen]

A current can only be induced if the magnetic flux changes (increases or decreases) through the loop. Watch the videos in this playlist: PHYSICS 45 ELECTROMAGNETIC INDUCTION kzbin.info/aero/PLX2gX-ftPVXV1z8nPIePOUk5WIGVYBzDy&disable_polymer=true

[@AAASSS-su9gy]

Michel van Biezen thanks for your reply but probably you didn't get what I mean Assume that 50 tesla is produced from coil1 and 30 tesla reaches coil2 thus coil 2 will try to oppose that change by generating a backward induced e.m.f that will induce current and also magnetic field and this magnetic field of COIL 2 will be in an OPPOSITE direction of the INITIAL field of coil1 and ot will act on COIL 1 thus the resultant magnetic flux acting on coil 1 will decrease so it should try to oppose that decrease by increasing its current. It is the first time for me to study this topic so things are confusing Thanks once again

[@MichelvanBiezen]

Only during a transient period. If there was initially zero flux and the the magnetic flux builds up to 30 tesla in the second coil, only during that period will there be an induced emf. When it reaches 30 tesla, the induced emf = 0.

[@dragokingprost8698]

Sir, are your lectures sufficient for Jee Advanced? (Indian class 12 student)

[@MichelvanBiezen]

Many students have written in that the videos were very helpful in praparation of the JEE advanced. But I think that also practicing with taking the old tests will help a lot. We have many examples of that in our videos.

[@vm9664]

Dislikes are pissed teachers 😪

[@jamest3592]

hi I wana ask a qustion why the mutual inductance in the booth are the same it can't be it should depend on the geometry of the two coils

[@MichelvanBiezen]

The inductance is the same in both. However if you change the geometry of one, the inductance in both will change equally.

[@nyx190]

How would the mutual inductance change if the coils were moved apart a distance R along the common axis?

[@MichelvanBiezen]

+Nicole Hemmings The mutual inductance depends on how much magnetic flux from the first coil goes through the second coil. If the second coil is moved farther away, then less flux will pass through the second coil and the mutual inductance will be smaller.

[@nyx190]

+Michel van Biezen That makes sense. How would the expression for mutual inductance change because of this?

[@rogerwood8285]

Do the coil of wire touch one another or are they insulated from one another

[@MichelvanBiezen]

The do not touch. If they touch, there will be insulation between them.

[@rogerwood8285]

@@MichelvanBiezen is it see through insulation

[@kaixuentow]

First,thx for ur video..it help me alot...but i m confuse about it is related to faraday's law?and self-inductance.

[@kaixuentow]

because they hav similar formula. e.g.they just changing L di/dt to M di/dt

[@MichelvanBiezen]

+Alex Tow Self inductance and mutual inductance are similar. A change in magnetic flux will induce an emf in a nearby loop AND it will induce an emf in the loop itself that caused the change in the flux.

[@kaixuentow]

Ok.thx

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[@mrv405]

Thank you so much!

[@MichelvanBiezen]

You're welcome!