Hi guys. I'm new here.(adsbygoogle = window.adsbygoogle || []).push({});

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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

**Physics Forums | Science Articles, Homework Help, Discussion**