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Question

When induced emf in inductor coil is 50 of its maximum value then stored energy in inductor coil in the given circuit will be-
1170725_91a23ea2848e4bc6a96e85b4e2feadc9.png

A
2.5mJ
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B
5mJ
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C
15mJ
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D
20J
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Solution

The correct option is A 2.5mJ
For max. induced emf across inductor will be at t=0, when it will behave as O.C.
V=2v=Vmax (el circuit Voltage will be same)
50 of its max. That means 1 volt.
When voltage of 1 volt appears across inductor
Then, 2=1×i+1
[I=1Amp]
Energy stored in inductor =12Li2
=12×5×12×103
E=2.5mJ

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