An electron with a velocity $2=(-3\mathrm{.}0$ i $+4\mathrm{.}0$ j$)$ km$/$s moves through amagnetic field given by B $=(3\mathrm{.}0$ i $+4\mathrm{.}0$ f$)$ mT$.($a$)$ Calculate the two components of the velocity that are parallel vy and perpendicular v to the magnetic field.$($b$)$ What is the radius of the motion?The mass of the electron is m $=9\mathrm{.}11\backslash$times $10-31$ kg$.$