First slide
Inductance
Question

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

Moderate
Solution

e2=Mdi1dti2R2=Mdi1dt0.4×5=0.5×di1dtdi1dt=4A/sec

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