Three long parallel wires are spaced 1 meter apart in the z0

Three long parallel wires are spaced 1 meter apart in the z=0 plane. They carry a 3A current in the +x direction. The middle wire runs along the x-axis. At z=+2m, what statement(s) are true about the magnetic field from the wires? Only a +y component Only a -y component A -y and +z component A -y and -z component

Solution

Answer is b