Two Long Parallel Straight Wires Carry Equal Currents in Opposite

Multiple Choice

Two long parallel straight wires carry equal currents in opposite directions.At a point midway between the wires, the magnetic field they produce is:

A) zero
B) non-zero and along a line connecting the wires
C) non-zero and parallel to the wires
D) non-zero and perpendicular to the plane of the two wires
E) none of the above