A magnetic dipole is placed at the right angles to the direction of magnetic induction B if it's rotated through an angle of 180° then the work done is
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work done = MB(cosθ1-cosθ2)
=MB( cos 90 - cos270)
=MB(0 -0)
=0
(as it is rotated through an angle 180, total angle will be 90 + 180)
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