A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0

Question

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

Professor PC Thomas Classes · Answer

The change in flux linkage is $\Delta\Phi = M \Delta I = 1.5 	imes 20 = 30 	ext{ Wb}$. The time taken is irrelevant for calculating the change in flux linkage itself.