Practice MCAT Question - Q47 - Answer!
Two wires, A and B separated by a distance d, carry currents iA and iB in opposite directions. Which statement is true? The magnetic field, B, produced by the current in wire A in turn produces
A. a net force on both wire A and wire B.
B. no net force on either wire A or wire B.
C. a net force on wire A only.
D. a net force on wire B only.
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The correct answer is (D). The magnetic field produced by a current in a wire has no effect on the current that produced it. It affects the current in nearby wires.
