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The magnetic potential energy stored in ...

The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance

A

1.389 H

B

138.88 H

C

0.138 H

D

13.89 H

Text Solution

Verified by Experts

The correct Answer is:
D
Energy stored in inductor coil is given by
`U= (1)/(2)LI^(2)`
`25 xx 10^(-3) = (1)/(2) xx L xx (60 xx 10^(-3))^(2)`
`L= (25 xx 2 xx 10^(6) xx 10^(-3))/(3600)= 13.89H`
Hence option (d) is correct.
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