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A rectangular current loop is placed in a uniform magnetic field. The net force on the loop is
AIAB
BZero
C2IAB
DIA²B
Answer & Solution
Correct answer: B. Zero
1. The four sides of the loop experience forces from F = IL × B.
2. Opposite sides carry currents in opposite directions, giving equal-and-opposite forces.
3. The vector sum of the four forces cancels in a uniform field.
4. A non-zero net torque can still act, but the net force is zero.
_Source: NCERT Class 12 Physics Ch 4 "Moving Charges and Magnetism", §4.10.1_
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