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. `2((tau)/(sqrt3BI))^(1/2)`
B. `2/sqrt3(tau/(BI))`
C. `2(tau/(BI))^(1/2)`
D. `1/sqrt3(tau)/(BI)`

Answer

A