A pair of adjacent coils has a mutual inductance of 2.0 H. If the current in one coil changes from 0 to 30 A in 0.5 s, the change of the magnetic flux linked with the other coil would be

60 Wb

The correct answer is Option (4) → 60 Wb

Mutual inductance relation:

$M = \frac{\Delta \Phi}{\Delta I}$

So, $\Delta \Phi = M \Delta I$

Given: $M = 2.0 \ \text{H}$, $\Delta I = 30 - 0 = 30 \ \text{A}$

$\Delta \Phi = 2.0 \times 30 = 60 \ \text{Wb-turn}$

Change of flux linked = 60 Wb-turn