Faraday's Law of Electromagnetic Induction

Faraday’s Laws of Electromagnetic Induction | First & Second Law

Faraday's Law of Electromagnetic Induction Image

Faraday summed up the above facts into two laws known as Faraday’s Laws of Electromagnetic
 Induction.

First Law.

It StatesWhenever the magnetic flux linked with a circuit changes, an e.m.f. is always induced in it.

  or

Whenever a conductor cuts magnetic flux, an e.m.f. is induced in that conductor.

Faraday's Law of Electromagnetic Induction Image

Second Law.

It States : The magnitude of the induced e.m.f. is equal to the rate of change of flux-linkages.Explanation. Suppose a coil has N turns and flux through it changes from an initial value of Φ1 webers to the final value of Φ2 webers in time t seconds. Then, remembering that by flux-linkages mean the product of number of turns and the flux linked with the coil, we have

Initial flux linkages = NΦ1, add Final flux linkages = NΦ


Faraday's Law of Electromagnetic Induction Formula
Putting the above expression in its differential form, we
get
Faraday's Law of Electromagnetic Induction Formula
Usually, a minus sign is given to the right-hand side expression to signify the fact that the induced
e.m.f sets up current in such a direction that magnetic effect produced by it opposes the very cause. This information is given in Lenz's Law.
Faraday's Law Of Electromagnetic Induction Formula




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