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

1. A. 2 3 ( Bi )
2. B. 1 3 Bi
3. C. 2 ( 3 Bi ) 1/2
4. D. 2 3 ( Bi ) 1/2

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