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

$ \Delta \phi = M \Delta I \Rightarrow M = \frac{\Delta \phi}{\Delta I}$

$ \Rightarrow M = \frac{15}{10} = 1.5 H$

The correct answer is Option (3) → 1.5 H