Question
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 from 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 $2.50 \times 10^4 \textrm{ N/C}$. (b) Explain why the electron will not be pulled back to the positive plate once it moves through the hole.
Question Image
1. $4.39 \times 10^{15} \textrm{ m/s}^2$
2. The net electric field outside of the plates is zero. See the solution video for an explanation as to why.
Solution Video