A Long Straight Wire Has a Constant Current Flowing to the Right

question 34

Multiple Choice

A long straight wire has a constant current flowing to the right. A rectangular metal loop is situated above the wire, and also has a constant current flowing through it, as shown in the figure. Which one of the following statements is true?

• A) The net magnetic force on the rectangle is upward, and there is also a nonzero torque on the rectangle.
• B) The net magnetic force on the rectangle is zero, and the net torque on it is zero.
• C) The net magnetic force on the rectangle is downward, and there is also a nonzero torque on the rectangle.
• D) The net magnetic force on the rectangle is zero, but there is a nonzero torque on the rectangle.
• E) The net magnetic force on the rectangle is downward, and the net torque on it is zero.

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