n electron moving with a velocityv $=4\mathrm{.}0$i $+3\mathrm{.}0$j $+2\mathrm{.}0$k

$()$

$106$ m$/$s enters a region where

there is a uniform electric field and a uniform magnetic field. The magnetic field is given byB $=1\mathrm{.}0$i $-2\mathrm{.}0$j $+4\mathrm{.}0$k

$()$

$10-2$ T

$.$ If the electron travels through a region without being deflected,

what is the electric field