A current of 10 A in the primary coil of a circuit is reduced to zero. If the coefficient of mutual inductance is 3 H and emf induced in the secondary coil is 30 kV, time taken for the change of current is

Question

A current of 10 A in the primary coil of a circuit is reduced to zero. If the coefficient of mutual inductance is 3 H and emf induced in the secondary coil is 30 kV, time taken for the change of current is, 10 3 s, 10 2 s, 10 - 3 s, 10 - 2 s

MARKS App · Accepted Answer

As e = M d i d t ∴ 30 × 10 3 = 3 × 10 d t , d t = 30 30 × 10 3 = 10 - 3 s

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