A thin bar magnet is placed in a uniform magnetic field and is aligned with the field. The needle is now rotated by an angle of 
and the work done is W. The torque on the magnetic needle at this position is
A
zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Given, work done = W and 
We know that, 
… (i)
Hence, torque, 
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