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Question

A coil of resistance 20 Ω and inductance 5 H has been connected to a 100 V battery The energy stored in the coil after a long time is


Your Answer
A
31.25 J
Correct Answer
B
62.5 J
Your Answer
C
125 J
Your Answer
D
250 J

Solution

The correct option is C 62.5 J


Energy stored in an inductor is given by
E=12LI2

Current at steady state =VR=10020=5 A

E=12(5)(5)2=1252=62.5 J

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