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Question

A short bar magnet of magnetic moment 0.4 JT1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium. Then the potential energy is,

A

0.64 J
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B

Zero
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C

0.082 J
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D


0.064 J
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Solution

The correct option is D

0.064 J

Given M=0.4 JT1,B=0.16 T

Stable equilibrium means θ between M & B=0

So Potential energy U=M.B=MB cos0U=MBU=0.4×0.16=0.064 J

Hence, option (D) is the correct answer.

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