4.
Four wires are running parallel at the corners of a square. The wires run parallel to the z axis and
hit the xy-plane at (x, y) coordinates: (0, 0), (10, 0), (0, 10), and (10, 10), where all numbers are in meters. The
magnitudes of the currents running through all four wires are the same, but the direction of the current flow is as
follows: the first three have the current running in the +z direction, and the last one runs in the -z direction. What is
the main direction of the total magnetic field at the point (5, 10)? (In other words, in what direction is the largest
component of the total magnetic field?)
a) -x direction
b) -y direction
c) -z direction
d) +x direction
e) +y direction
f) +z direction
h) Not enough information given. What is missing?
g) no direction
Reasoning:
