Two long straight wires

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Two long straight wires, each carrying a current II in opposite directions, are separated by a distance RR. The magnetic induction at a point midway between the wires is (a) Zero (b) μ0IπR\frac{\mu_0I}{\pi R} (c) 2μ0IπR\frac{2\mu_0I}{\pi R} (d) μ0I4πR\frac{\mu_0I}{4\pi R}

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