An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current T along the same direction is shown in fig. Magnitude of force per unit a length on the middle wire 'B' is given by

\[\frac{{{\mu }_{0}}{{i}^{2}}}{2\pi d}\]

\[\frac{2{{\mu }_{0}}{{i}^{2}}}{\pi d}\]

\[\frac{\sqrt{2}{{\mu }_{0}}{{i}^{2}}}{\pi d}\]

\[\frac{{{\mu }_{0}}{{i}^{2}}}{\sqrt{2}\pi d}\]

An arrangement of three parallel straight wires placed perpendicular t

1.	An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current T along the same direction is shown in fig. Magnitude of force per unit a length on the middle wire 'B' is given by
A.	\[\frac{2{{\mu }_{0}}{{i}^{2}}}{\pi d}\]
B.	\[\frac{\sqrt{2}{{\mu }_{0}}{{i}^{2}}}{\pi d}\]
C.	\[\frac{{{\mu }_{0}}{{i}^{2}}}{\sqrt{2}\pi d}\]
D.	\[\frac{{{\mu }_{0}}{{i}^{2}}}{2\pi d}\]
Answer» D. \[\frac{{{\mu }_{0}}{{i}^{2}}}{2\pi d}\]