Mutual induction & inductance | Electromagnetic induction | Physics | Khan Academy

When changing current in one coil induces an EMF in the other, the phenomenon is called mutual induction. The strength of the EMF induced depends on the mutual inductance of the pair of coils. The S.I. unit of mutual inductance is Henry, the same as that of self-inductance.
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Created by Mahesh Shenoy

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should the induced current be flipped?

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How is the current continuously changing in the primary coil?? as DC will be constant after some time and inductor blocks AC...

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If you look closely you will see that the power source is a transformer ie AC

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Sir you told current is changing in coil 1 which leads to change in magnetic flux how is current changing in that coil????

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We can use alternating currents to keep the current changing I Guess

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Coil 1 is connected to an AC voltage source, therefore the magnetic flux is changing.

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u said M21 depends on the geo of th second coil also the other. so how can it be equals to each other while their geo is no equal? pls give me an exponation

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Mutual inductance is like a resultant of both these quantities
For example if coil 1 has N turns and coil 2 has M turns
The M21 will depend on product of the turns ie.. MN
Hence it will be same

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If u move the second coil the flux decrease ok.. But the rate of change of flux is same as that u move it towards the first coil.. So why the brightness of the bulb decrease?

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