Question

Give two definitions of mutual inductance and write its unit.

Answer 1

$\left(i\right)$ Mutual inductance of two coils is equal to the $e.m.f$ induced in one coil when when rate of changes of current through the other coil is unity$.$

$\left(ii\right)$ Mutual inductance of two coils is defined as the magnetic flux linked with the secondary coil when the current in primary coil is $1$ ampere$.$

$S.I.$ unit of mutual induction is $henry.$