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

question 15

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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