An electron moes with speed $2 \times 10^5\; m/s$ along the positive $x$-direction in the presence of a magnetic field of induction $\overrightarrow{B} = \hat{i} + 4 \hat{j} - 3 \hat{k}$ (in tesla). The magnitude of the force experienced by the electron in newtons is : <br> (Charge on the electron =$1.6 \times 10^{-19}C$)