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A short bar magnet having magnetic momen...

A short bar magnet having magnetic moment `M=0.80 JT^1` is placed in uniform magnetic field of 0.30 T. If bar magnet is free to rotate in plane of field, then (where U is potential energy and tau is torque)

A

At stable equilibrium,U=`0.24` J, tau=0

B

At stable equilibrium U=`0.2`4` J,`tau `= 0

C

At stable equilibrium U=`-0.24` J, `tau`=0

D

At stable equilibrium U= `-0.24` J,`tau `= 0

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