Why is the following situation impossible? An electron enters a region of unifor

Question

Why is the following situation impossible? An electron enters a region of uniform electric field between two parallel plates. The plates are used in a cathode-ray tube to adjust the position of an electron beam on a distant fluorescent screen. The magnitude of the electric field between the plates is 200 N/C. The plates are 0.200 m in length and are separated by 1.50 cm. The electron enters the region at a speed of 3.00 times 10^6 m/s, traveling parallel to the plane of the plates in the direction of their length. It leaves the plates heading toward its correct location on the fluorescent screen. This answer has not been graded yet.

Explanation / Answer

whenever the elctron eneters the region between tha plates the electric field between the plates exert electric force on elctron towards positive plates.

so, the elctron deflects towards positive plate. So, it can not move straight away.

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