A long straight wire has a constant current flowing to the right. A square ring

Question

A long straight wire has a constant current flowing to the right. A square ring is situated above the wire, and also has a constant current flowing through it (as shown below). Which following statements is true? A) The net magnetic force on the ring is zero, but there is a net torque on the ring B) The net magnetic force on the ring is downward, and the net torque is zero. C) The net magnetic force on the ring is upward, and there is also a net torque on the ring D) The net magnetic force on the ring is zero, and the net torque is zero. E) The net magnetic force on the ring is downward, and there is also a net torque on the ring

Explanation / Answer

B.

The net magnetic force on the ring is downward, and the net torque is zero

resultant force acts downwards

but the net torque is the sum of the moments which is equal to zero

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