A current carry square loop ABCD is placed at a distance a from an infinitely long current carrying long straight conductor PQ as shown in the figure. The conductor PQ lies in the plane of the loop. Then

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magnetic potential energy stored in the system is zero.

the square loop experiences a net torque.

the loop experiences a net force towards the conductor PQ.

the loop experiences a net force away from PQ.

answer is C.

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Detailed Solution

F→DA=F→BCF→AB=i AB→×B→1FAB=i×a×μoI2πaF→CD=i CD→×B→2=i×a×μoI2π2a∴FAB>FCD

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