A bar magnet having a magnetic moment of is free to rotate in a horizontal plane. A horizontal magnetic field exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction from the field is
(a) 0.6 J (b) 12 J
(c) 6 J (d) 2 J
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Concept Questions :-
The work done in rotating a magnetic dipole against the torque acting on it, when placed in magnetic field is stored inside it in the form of potential energy.
When magnetic dipole is rotatd from initial position to final position then work done =MB