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A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°.

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asked Mar 24, 2018 in Physics by paayal (26,720 points) ● 4 ● 6 ● 46

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque needed to maintain the needle in this position will be

(a) √3W 

(b) W

(c) (√3/2)W 

(d) 2W.

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answered Mar 24, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Mar 26, 2018 by Vikash Kumar
 
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