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  4. A magnetic dipole is placed at right angles to the direction of lines of force of magnetic induction B. If it is rotated through an angle of 180°, then the work done is

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Q. A magnetic dipole is placed at right angles to the direction of lines of force of magnetic induction $B$. If it is rotated through an angle of $180^{\circ}$, then the work done is

Magnetism and Matter

Solution:

$U_{i}=-M B \cos 90^{\circ}$
$U_{f}=-M B \cos 90^{\circ}$
$W=0-0=0$