The effect due to a uniform magnetic field on | vedclass

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(B) When a magnetic needle is placed in a uniform magnetic field $B$,the north pole experiences a force $F = mB$ and the south pole experiences a forc

Vedclass · Accepted Answer

torque is present but no net force

Vedclass · Answer

(B) When a magnetic needle is placed in a uniform magnetic field $B$,the north pole experiences a force $F = mB$ and the south pole experiences a force $F = -mB$,where $m$ is the pole strength.Since the forces are equal in magnitude and opposite in direction,the net force $F_{net} = F + (-F) = 0$.However,because these forces act at different points,they create a torque $	au = p_m 	imes B$,which tends to rotate the needle to align it with the magnetic field.Therefore,torque is present but there is no net force.

The effect due to a uniform magnetic field on a freely suspended magnetic needle is as follows:

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