A coil in the shape of an equilateral triangle of side `l` is suspended between the pole pieces of permanent magnet. Such that `vecB` 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 triangel is:A. `(2)/(sqrt(3))((tau)/(Bi))^((1)/(2))`B. `(2)/(3)((tau)/(Bi))`C. `2((tau)/(sqrt(3) Bi))^((1)/(2))`D. `(1)/(sqrt(3)) (tau)/(Bi)`

A coil in the shape of an equilateral triangle of side `l` is suspende

1.	A coil in the shape of an equilateral triangle of side `l` is suspended between the pole pieces of permanent magnet. Such that `vecB` 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 triangel is:A. `(2)/(sqrt(3))((tau)/(Bi))^((1)/(2))`B. `(2)/(3)((tau)/(Bi))`C. `2((tau)/(sqrt(3) Bi))^((1)/(2))`D. `(1)/(sqrt(3)) (tau)/(Bi)`
Answer» Correct Answer - C `tau = MB sin 90^(@) = MB` `tau = iAB = i((sqrt(3) l^(2))/(4))B` `l^(2) = (4 tau)/(sqrt(3)iB) rArr l = 2((tau)/(sqrt(3) Bi))^((1)/(2))`

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