Four long wires are perpendicular to the x-y plane. Each wire carries the same magnitude current. Wire 1 goes through point (a, a, 0) on the x-y plane, wire 2 goes through the point (–a, a, 0), wire 3 goes through the point (–a, –a, 0), and wire 4 goes through the point (a, –a, 0). Wires 1 and 3 carry their currents in the positive z direction and wires 2 and 4 carry their currents in the

Question

–z direction. What is the direction of the resulting magnetic field at the origin?
a. in the +x direction
b. in the –y direction
c. in the –x direction
d. There is no direction since the field is zero at this point.

Answer 1

D