Question

(i) Define mutual inductance.
(ii) A pair of adjacent coils has a mutual inductance of $1.5H$. If the current in one coil changes from $0$ to $20A$ in $0.5s$, what is the change of flux linkage with the other coil?

Answer 1

(i) : Mutual inductance $\left(M\right)$ is the property of the coils that a current is induced in the secondary coil if there is a change in current in the primary coil.
Its SI unit is Henry.
(ii) :
Given : $M=1.5H$
Change of current $\Delta I=20-0=20A$
Change of flux $\Delta \varphi =M\Delta I=1.5\times 20=30Wb$