The mutual inductance between a primary and secondary circuits is 0.5 H. The resistances of the primary and the secondary circuits are 20 ohms and 5 ohms respectively. To generate a current of 0.4 A in the secondary, current in the primary must be changed at the rate of
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A
Given, coefficient of mutual inductance, 
Resistance of primary, 
Resistance of secondary, 
Let, current in primary be 
, such that current is secondary is 
.
Now, the emf induced in secondary due to change primary current is given by
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