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A magnetic needle lying parallel to tge magnetic field requires W units of work to turn it through an angle of 45°.The torque required to maintain the needle in the position will be??

A magnetic needle lying parallel to tge magnetic field requires W units of work to turn it through an angle of 45°.The torque required to maintain the needle in the position will be??

Grade:12th pass

1 Answers

Adarsh
768 Points
4 years ago
Work done in rotating magnetic material in magnetic field = MBcos45 = W
Torque on needle = MBsin45 
 (since sin 45 = cos 45) so . the magnitude of torque will also be equal to W … 

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