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The question is.

There are two particles, one with charge -q and the other with charge Q, and -q particle rotates around the Q particle at a radius r1. What is the Energy at this point?

The answer is like this: E= KE + U

So now I know that U= -kQq/r1

But according to the answer: KE= kQq/2r1. And I have no idea how they found this KE. Your help would be appreciated. Thanks in advance.

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# Hi, I am Tarabas. I have a question regarding KE

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