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A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that B→ is in the plane of the coil. If due to a current i in the triangle a torque τ acts on it, the side l of the triangle is
Correct Option: B
τ = MB sinθ
τ = iAB sin90º
∴ A = | ||
iB |
Also, A = 1/2 (BC) (AD)