A square current-carrying loop lies in a uniform magnetic field in the plane of the loop. If the magnetic force on one arm is F⃗, find the net magnetic force on the remaining three arms.
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Question

A square current-carrying loop lies in a uniform magnetic field in the plane of the loop. If the magnetic force on one arm is F⃗, find the net magnetic force on the remaining three arms.

G1 Physics · Accepted Answer

Step 1: A complete current loop in uniform magnetic field has zero net force although individual segments may carry forces. Step 2: The three remaining arms must balance the magnetic force F⃗ on the first arm. Step 3: Therefore F⃗_remaining=−F⃗. Answer B. Final answer: (B) −F⃗.