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In the figure, an electron accelerated from rest through potential difference $V_1=1\mathrm{.}13kV$ enters the gap between two parallel plates having separation $d=16\mathrm{.}2mm$ and potential difference $V_2=113V.$ 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?

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