1.

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque required to maintain the needle in this position will be                                     [KCET 1994; MNR 1991; MP PET 1996; [AIEEE 2003; UPSEAT 2000; BHU 2004; Pb PET 2004]

A.            \[\sqrt{3}\,W\]
B.            W
C.            \[\frac{\sqrt{3}}{2}W\]    
D.            2W
Answer» B.            W


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