04.31: Two very long current-carrying wires are
4l.5 u,huw06f yz mute shown end on in the figure below. The wire on
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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.