Questions
A bar magnet of magnetic moment is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of to a direction from the field will be
detailed solution
Correct option is A
Magnetic moment of bar, M=104 J/THence, work done, W=MB(cos 0 - cos 60) = MB2 =104 x 4 x l0-5 x cos60o = 0.2 JSimilar Questions
A magnet of magnetic moment M is situated with its axis along the direction of a magnetic field of strength B. The work done in rotating it by an angle of will be
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