A circular coil of 20 turns and radius $10\;cm$ is placed in a uniform magnetic field of $0.10\;T$ normal to the plane of the coil. If the current in the coil is $5.0 \;A$ What is the total torque on the coil ? (The coil is made of copper wire of cross sectional area $`10^{-5}\;m^2$ and the free electron density is given to be $10^{29}/m^3$

Question

$\begin{array}{1 1} zero \\ 3.14 \times 10^{-5}N-m \\ 3.14 \times 10^{-5}N/m \\ 3.14 \times 10^{-5}N-m^2 \end{array} $