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

Options

A. `(1)/(sqrt(3))((tau)/(BI))`
B. `2((tau)/(sqrt(3)BI))^(1//2)`
C. `(2)/(sqrt(3))((tau)/(BI))^(1//2)`
D. `2((tau)/(sqrt(3)BI))^(1//2)`

Answer

B