An electron (mass = $9.1 \times {10}^{-31 }\mathrm{kg}$; charge = $- 1.6 \times {10}^{-19} \mathrm{C}$) experiences no deflection if subjected to an electric field of $3.2 \times {10}^5 \mathrm{V} {\mathrm{m}}^{-1}$ and a magnetic field of $2.0 \times {10}^{-3} \mathrm{Wb} {\mathrm{m}}^{-2}$. Both the fields are normal to the path of electron and to each other. If the electric field is removed, then the electron will revolve in an orbit radius