04.31: Two very long current-carrying wires are shown end on in
3ul ueup;w9x ,the figure below. The wi
w9,;uupulex3re on
the left has a 4A current going into of the plane of the paper and the wire on the right has a 3A
current coming out of the paper. Disregarding the case of x → ±∞, in which region(s) could the
magnetic field from these two wires add to zero on the x-axis.