A short bar magnet of magnetic moment 
is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, then the potential energy which would corresponds to its unstable equilibrium is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
For unstable equilibrium, m is to be anti-parallel to B. In this case, 
, thus
Given, 
and 
Hence, 
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