The effect due to a uniform magnetic field on | vedclass

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Question

(B) When a magnetic needle is placed in a uniform magnetic field, the magnetic field exerts a force $F = mB$ on the north pole and $F = -mB$ on the so

Vedclass · Accepted Answer

torque is present but no net force

Vedclass · Answer

(B) When a magnetic needle is placed in a uniform magnetic field, the magnetic field exerts a force $F = mB$ on the north pole and $F = -mB$ on the south pole, where $m$ is the pole strength and $B$ is the magnetic field intensity.Since the forces are equal in magnitude and opposite in direction, the net force on the needle is $F_{net} = mB - mB = 0$.However, because these forces act at different points (the poles), they form a couple that exerts a torque $	au = mB 	imes l \sin(	heta)$ on the needle, which tends to align it with the magnetic field.Therefore, a torque is present, but the net force is zero.

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

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