Question

The magnitude of the induced emf in the coil is directly proportional to the rate of change of flux linkages. This is known as

Answer 1

answer : Faraday's 2nd law

explanation : according to Faraday's 2nd law , The magnitude of induced electromotive force (emf) in the coil is directly proportional to the rate of change of flux linkages.

if $\xi$ denotes the electromotive force generated in the coil and $\phi$ denotes the magnetic flux

then from Faraday's 2nd law,

$\xi\propto\frac{d\phi}{dt}$

here $\frac{d\phi}{dt}$ indicates rate of change of flux linkages.