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Q. A current-carrying square loop is placed near an infinitely long current-carrying wire as shown in the figure. The torque acting on the loop is

Question

NTA AbhyasNTA Abhyas 2020Moving Charges and Magnetism

Solution:

The force acting on the loop $PQRSP$ due to current $i_{1}$ through the long wire are acting in the plane of loop. Due to which, the torque on loop is zero.