An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current $'I'$ along the same direction as shown in fogure. Magnitude of force per unit length on the middle wire $'B'$ is given by

Question

${{2{\mu _0}{I^2}} \over {\pi d}}$

${{\sqrt 2 {\mu _0}{I^2}} \over {\pi d}}$

${{{\mu _0}{I^2}} \over {\sqrt 2 \pi d}}$

${{{\mu _0}{I^2}} \over {2\pi d}}$

Solution

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