Solution:
The mutual inductance ($M$) is calculated by the ratio of flux change in coil Y to the current change in coil X:
$$M = \frac{\Delta \phi_Y}{\Delta I_X} = \frac{0.4 \text{ Wb}}{2 \text{ A}}$$
$M = 0.2 \text{ H}$
Two coils X and Y are placed in a circuit such that a current changes by 2 A in coil X and the magnetic flux change of 0.4 Wb occurs in coil Y. The value of mutual inductance of coils is :
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