In a pair of adjacent coils, for a change of current in one of the coils from 0 A to 10 A in 0.25 s, the magnetic flux in the adjacent coil changes by 15 Wb. The mutual indutance of the coils is _________.

Fill in the blank with the correct answer from the options given below.

1.5 H

The correct answer is Option (3) → 1.5 H

The mutual inductance M between two cells,

$ \Delta \phi = M \Delta I$

where,

$ \Delta \phi$ = Change in magnetic flux

$\Delta I$ = Change in current

$M = \frac{\Delta \phi}{\Delta I}=\frac{15Wb}{10A} = 1.5 H$