A coil in the shape of an equilateral triangle of side \( I \) is s...

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A coil in the shape of an equilateral triangle of side \( I \) is suspended between the pole pieces of a permanent magnet such that \( \vec{B} \) is in plane of the coil. If due to a current \( i \) in the triangle a torque \( \tau \) acts on it, the side \( I \) of the triangle is :
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