Question

explain torque on a rectangular current loop in a uniform magnetic field
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Answer 1

Answer:

(a) The rectangular wire loop is placed in a magnetic field. The forces on the wires closest to the magnetic poles (N and S) are opposite in direction as determined by the right-hand rule-1. Therefore, the loop has a net torque and rotates to the position shown in (b). ... This causes continual rotation of the loop.

Answer 2

Force Between Parallel Current Carrying Wires

If the parallel wires currents in opposite directions, the wires repel each other. The wires attract each other if current in the wires are flowing in the same direction. And they repel each other if the currents are in opposite directions.