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

Question

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

Quizplus · Accepted Answer

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

A Long Straight Conductor Has a Constant Current Flowing to the Right.A