Faraday's Law of Electromagnetic Induction
Faraday’s Laws of Electromagnetic Induction | First & Second Law
First Law.
It States : Whenever 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.
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
Putting the above expression in its differential form, we
get
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.
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