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In the figure, an electron accelerated from rest through potential difference V1=1.39 kV enters the gap...

In the figure, an electron accelerated from rest through potential difference V1=1.39 kV enters the gap between two parallel plates having separation d = 22.1 mm and potential difference V2= 98.7 V. 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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