Question

Induced emf would be there only for that much duration for which ____________
linked with circuit is ___________.

Answer 1

1. change in the magenectic flux 2.d. selphone

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Answer 2

Induced emf would be there only for that much duration for which MAGNETIC FLUX linked with circuit is CHANGED.

The general expression for induced EMF linked with a circuit is given as follows:

$\boxed{ \bold{ \large{EMF = \dfrac{d \phi}{dt} }}}$

As per Faraday's Law of Electromagnetic Induction , " the induced EMF is directly proportional to the instantaneous rate of change of magnetic flux with respect to time "

Here $d\phi$ refers to change in magnetic flux and dt refers to time interval for which the flux changes.

• Hence , if the magnetic flux remains constant with respect to time , the induced EMF in the coil will.be zero.