![]() So, we are dealing with electrons, so the charge is the elementary charge of 1.6 times ten to the minus 19 coulombs times two times ten to the six volts per meter electric field strength times 0.400 meter distance travelled and then we are asked to express our answers in unit of kilo-electron volt. ![]() So… we have a change in energy then is charge times electric field times distance. Now, the potential difference for a uniform electric field is the electric field multiplied by the distance travelled through the field and we substitute that in for V and this is the same formula we have for the potential difference between two large conducting parallel plates and the reason it applies is because the electric field between two large conducting parallel plates is uniform. The size of the change in kinetic energy of this electron is equal to the size of the change in its potential energy which will be its charge times V and I am putting these absolute value bars here to say, let’s just ignore negative signs. ![]() ![]() This is College Physics Answers with Shaun Dychko.
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