An electron moving horizontally passes between two horizontal plates, the upper

Question

An electron moving horizontally passes between two horizontal plates, the upper charge negatively, the lower charge positively. A uniform, upward-riected electrical field exist in teh region between the plates, and the field exerts an electic force down on the electon. Describe the movement of the electron in the region.

My answer would be that the electron would bounce back and forth between the plates until it has neurtalized both plates but I have a feeling that is incorrect due to the movement of the E field.

Explanation / Answer

the electric force exerted on the electron go downward, the same as gravity. So net acceleration of the electron is downward. The projectile motion of the electron is so simple. Its keep going horizontally while accelerate vertically downward until it get out of the area of hit the plate (if it hit the plate, there is a big chance that it ll be stuck in the plate and cant get out)

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