A coil in the shape of an equilateral triangle of side $l$ is suspended between the pole pieces of a permanent magnet such that $\overrightarrow B $ is in plane of the coil. If due to a current i in the triangle a torque $\tau $ acts on it, the side $l$ of the triangle is

Question

${2 \over {\sqrt 3 }}\left( {{\tau \over {Bi}}} \right)$

$2{\left( {{\tau \over {\sqrt 3 Bi}}} \right)^{1/2}}$

${2 \over {\sqrt 3 }}{\left( {{\tau \over {Bi}}} \right)^{1/2}}$

${1 \over {\sqrt 3 }}{\tau \over {Bi}}$

Solution

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