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A rectangular coil \( P Q \) has \( 2 n \) turns, an area \( 2 a \) and
\( \mathrm{P} \) carries a current \( 2 I \), (refer figure). The plane of the

W coil is at \( 60^{\circ} \) to a horizontal uniform magnetic field of flux density \( \mathrm{B} \). The torque on the coil due to magnetic force is
(A) \( B n a I \sin \sin 60^{\circ} \)
(B) 8 BnaI \( \cos 60^{\circ} \)
(C) \( 4 n a I B \sin 60^{\circ} \)
(D) None of these
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