From Coulomb's law, the electrostatic force is:
Newton's second law:
From the two equations, we have, ma = qE
A simple and common technique for accelerating electrons is shown in Figure 18.55, where there is a uniform electric field between two plates. Electrons are released, usually a hot filament, near the negative plate, and there is a small hole in the positive plate that allows the electrons to continue moving.
(a) Calculate the acceleration of the electron if the field strength is 2.50x104 N/C.
(b) Explain why the electron will not be pulled back to the positive plate once it moves through the hole.
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