alleryFor a current loop in a non-uniform magnetic field, net force is zero only if:
AField is zero
BField is UNIFORM (constant in space)
CLoop is small
DCurrent is small
Answer & Solution
Correct answer: B. Field is UNIFORM (constant in space)
In uniform B, all parts of the loop experience equal and opposite forces — net force zero (but torque can be nonzero).
In non-uniform B, opposite sides of loop see different B, leading to net force (causes a magnetic dipole to be pulled toward higher field regions for an aligned moment).
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