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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017
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An arrangement of three parallel straight wires placed perpendicular to plane of papei carrying same current'I' along the same direction is shown in the figure . Magnitude of force per unit length on the middle wire'B' is given by

$\begin{array}{1 1} (1) \frac{\mu_0 i^2}{2 \pi d} \\ (2) \frac{2 \mu_0 i^2}{ \pi d} \\ (3) \frac{\sqrt 2 \mu_0 i^2}{ \pi d}\\ (4) \frac{\mu_0 i^2}{\sqrt 2 \pi d}\end{array} $

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