A coil in the shape of an equilateral triangle of side 10 cm lies in a vertical plane between the pole pieces of permanent magnet producing a…

A coil in the shape of an equilateral triangle of side $\displaystyle 10$ cm lies in a vertical plane between the pole pieces of permanent magnet producing a horizontal magnetic field $\displaystyle 20$ mT. The torque acting on the coil when a current of $\displaystyle 0.2$ A is passed through it and its plane becomes parallel to the magnetic field will be $\displaystyle \sqrt{x} \times 10^{-5} \mathrm{Nm}$. The value of $\displaystyle x$ is \_\_\_\_.