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Q.

The inductance of a coil is 60 μH. A current in this coil increases from 1.0 A to 1.5 A in 0.1 s. The magnitude of the induced e.m.f. is

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a

60×10-6 V

b

300×10-4 V

c

30×10-4 V

d

3×10-4 V

answer is D.

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Detailed Solution

|e|=Ldidt=60×10-6·(1.5-1.0)0.1=3×10-4 V
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The inductance of a coil is 60 μH. A current in this coil increases from 1.0 A to 1.5 A in 0.1 s. The magnitude of the induced e.m.f. is