A short bar magnet of magnetic moment 0.4 J/T is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
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a
−0.082 J
b
0.064 J
c
−0.064 J
d
Zero
answer is C.
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Detailed Solution
For stable equilibrium , U=−MB ⇒U=−0.40.16=−0.064J