Define ‘Inductance’ .

It is measure of the e.m.f produced in a circuit as the result of magnetic effect of changing in electric current either in that circuit or in another.
$\begin{array}{l}\mathrm{e}=-\mathrm{L}\frac{\mathrm{di}}{\mathrm{dt}}\\ \mathrm{e}=-\mathrm{M}\frac{\mathrm{di}}{\mathrm{dt}}\end{array}$