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The work done in turning a magnet of magnetic moment M by an angle of 90° from the meridian, is n times the corresponding work done to turn it through an angle of 60°. The value of n is given by
(a) 2
(b) 1
(c) 0.5
(d) 0.25
(a)
Magnetic moment = M; Initial angle through which magnet is turned (q1) = 90° and final angle through which magnet is turned (q2) = 60°. Work done in turning the magnet, through 90o(W1) = MB (cos 0° - cos 90°)
= MB (1-0) = MB.
Similarly, W2 = MB (cos 0° - cos 60°)
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