A circular coil of $20$ turns and radius $10 \mathrm{cm}$ is placed in an uniform magnetic field of $0.1 \mathrm{T}$ normal to the plane of the coil. The coil carries a current of $5 \mathrm{A}$. The coil is made up of copper wire of cross-sectional are ${10}^{-5} {\mathrm{m}}^2$ and the number of free electrons per unit volume of copper is ${10}^{29}$. The average force experienced by an electron in the coil due to magnetic field is