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

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