A magnet of magnetic moment $ 20 $ $C.G.S.$ units is freely suspended in a uniform magnetic field of intensity $0.3 $ $ C.G.S.$ units. The amount of work done in deflecting it by an angle of $30°$ in $ C.G.S.$ units is
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(c)Work done $W = M{B_H}\left( {1 - \cos \theta } \right)$
$ = 20 \times 0.3\left( {1 - \cos 30^\circ } \right) = 6\left( {1 - \frac{{\sqrt 3 }}{2}} \right) = 3\left( {2 - \sqrt 3 } \right)$
$ = 20 \times 0.3\left( {1 - \cos 30^\circ } \right) = 6\left( {1 - \frac{{\sqrt 3 }}{2}} \right) = 3\left( {2 - \sqrt 3 } \right)$
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