The forces on AD and BC are zero because magnetic field due to a straight wire on AD and BC is parallel to elementary length of the loop.
JEE Main 2009 — Physics Electromagnetism
Due to the presence of the current l1 at the origin
Held on 30 Apr 2009 · Verified 6 Jul 2026.
The forces on AB and DC are zero
The forces on AD and BC are zero
The magnitude of the net force on the loop is given by 4πμ0I1[2(b−a)+3π(a+b)]
The magnitude of the net force on the loop is given by 24abμ0∥1(b−a)
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