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Homework Statement
Drawing of the Problem
An electron rests on plate A and is accelerated by a 400V Plate (B). From there, Calculate the Maximum Voltage a 3cm plate (C) can be charged before the electron makes contact with the plate. Directly opposite Plate (C), is a +100V Charged Plate D.
Homework Equations
Electrostatic forumulas
The Attempt at a Solution
I assume the first step would be to calculate the velocity at which the electron leaves Plate B.
Voltage is 400V, and Ep can be calculated using Ep = q * V
Ep = (1.60 * 10^-19) * 400
= 6.4 * 10^-17
Ek = Ep
Ek = 6.4 * 10^-17
1/2mV^2 = 6.4 * 10^-17
V = 1.2 * 10^7
Is that correct for the velocity when the electron leaves Plate B?
After this, I have to calculate the maximum Voltage. That really isn't a massive problem as I can do that part by myself. The part that confuses me is that now I have a 400V current in the plate A pulling my electron back. Can someone show me how id do that?
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