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A magnetic needle of moment m makes angle theta with field B. What is the torque on it?
AmB sin(theta)
BmB cos(theta)
CmB tan(theta)
DmB / sin(theta)
Answer & Solution
Correct answer: A. mB sin(theta)
The torque is the cross product of m and B, whose magnitude is mB sin(theta), a restoring torque.
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