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Question

The inductance of a coil is L=10H and resistance R=5Ω. If applied voltage of battery is 10V and it switches off in 1 millisecond, find induced electromotive force of inductor.

A
2×104V
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B
1.2×104V
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C
2×104V
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D
None of these
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Solution

The correct option is A 2×104V
According to question.....................
φ=Lior,edφdt=ddt(Li)or,e=LdidtInducedcurrent=VR=105=2ACircuitswitchesoffin1millisecondor,dt=1×103sand,L=10HInducedempininductoris|e|=10×21×103=2×104VsotheoptionisA.

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