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Question

Question: In the figure magnetic energy stored in the coil is <img src="https://cdn.pureessence.tech/canvas_1...

In the figure magnetic energy stored in the coil is

A

Zero

B

Infinite

C

25 J

D

None of these

Answer

25 J

Explanation

Solution

U=12Li2=12×2(102)2=25 JU = \frac { 1 } { 2 } L i ^ { 2 } = \frac { 1 } { 2 } \times 2 \left( \frac { 10 } { 2 } \right) ^ { 2 } = 25 \mathrm {~J}