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(A) According to Faraday's law of electromagnetic induction,the induced electromotive force $(e)$ in a loop is given by $e = -\frac{d\phi}{dt}$,where

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When magnetic field linked with the loop changes rapidly.

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(A) According to Faraday's law of electromagnetic induction,the induced electromotive force $(e)$ in a loop is given by $e = -\frac{d\phi}{dt}$,where $\phi$ is the magnetic flux linked with the loop.Since the induced current $I = \frac{e}{R}$ (where $R$ is the resistance of the loop),the induced current is directly proportional to the rate of change of magnetic flux,i.e.,$I \propto \frac{d\phi}{dt}$.Therefore,the induced current is maximum when the rate of change of magnetic flux $(\frac{d\phi}{dt})$ is maximum.This occurs when the magnetic field linked with the loop changes rapidly.

In which of the following cases will maximum electric current be induced in the loop?

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