In the figure, an electron accelerated from rest through potential difference $V_1=1\mathrm{.}06kV$ enters the gap between two parallel plates having separation $d=15\mathrm{.}2mm$ and potential difference $V_2=186V.$ The lower plate is at the lower potential. Neglect fringing and assume that the electron's velocity vector is perpendicular to the electric field vector between the plates. In unit$-$vector notation, what uniform magnetic field allows the electron to travel in a straight line in the gap?

Number $($ hat$(i)+$ widehat$(j)+$ i k$)$ Units $$