Recent content by Tarabas

Thanks a lot. I actually checked my textbook and it was nowhere. :D

Homework Statement E=(1/4πε0)(Q/r^2) for R<r<2R Homework Equations U= integral (2R,R) ( (ε0 E^2)/2*4πr^2 dr The Attempt at a Solution I have no idea where the U-formula comes from. Any help would be appreciated. I added some pictures so that it could be easier to understand.

Thnx. I got it. Now I'm laughing how I couldn't figure it out .

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...

Hi guys. I'm new here. 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...