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A bar magnet of magnetic moment M is hun...

A bar magnet of magnetic moment M is hung by a thin cotton thread in a uniform magnetic field B. Work done by the external agent to rotate the bar magnet from stable equilibrium position to 120° with the direction of magnetic field is (consider change in angular speed is zero)

A

A. `(3MB)/2`

B

B. `(MB)/2`

C

C. MB

D

D. `(-MB)/2`

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