Question

You want to charge a 58.9H inductor, and it is connected in series with a 20.6V...

You want to charge a 58.9H inductor, and it is connected in series with a 20.6V battery and a 7.5Ω resistor. After 20 hours of being connected, what is the energy stored in the inductor's magnetic field?

a) 35.55 J

b) 22.22 J

c) 44.44 J

d) 133.31 J

e) 222.18 J

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Answer #1

Ans:(b) 222.18 J

Explanation:

We know the current at a time t in an inductor is given as

After a long time ( t=20 h) , the current will be

V =20.6 V , R =

Energy stored in the inductor's magnetic field is

Energy stored in the inductor's magnetic field is 222.18 J.

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