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 2.50×104 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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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Coulomb's Law (Electric Force) concept. You can view video lessons to learn Coulomb's Law (Electric Force). Or if you need more Coulomb's Law (Electric Force) practice, you can also practice Coulomb's Law (Electric Force) practice problems.
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Based on our data, we think this problem is relevant for Professor Keilty's class at LONESTAR.