A coil in the shape of an equilateral triangle of side \( \ell \) i...

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A coil in the shape of an equilateral triangle of side \( \ell \) is suspended between the pole places of a permanent magnet, Such that B fixed is in plae of the coil. If due to a current 1 in the triangle, a torque \( \tau \) acts on it, then side \( \ell \) of the triangle is:
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