# Why is Electrostatic Potential Energy positive when the charges are like?

We know that in an atom charge of an electron at infinity is zero. As it approaches the nucleus it become more and more negatively charged.
We also know that E.P.E is positive when charges are like and negative when charges are opposite. Well does it mean that as an electron approaches nucleus there is repulsion which causes the approaching electron to go away. As the electron go away it is getting closer to to infinity point because of which electron become less and less negatively charged. So the E.P.E is positive .Nucleus of atom is like earth and the electron are objects.The farther the object move from earth it has more Potential energy.

• The charge of an electron doesn't go to zero when it approaches infinite separation from a nucleus. An electron has an inherent charge regardless of this separation. However, the interaction energy between a negatively charged electron and a positively charged nucleus goes to zero as the separation goes to infinity. Oct 31, 2014 at 11:14

The charge of the electron doesn't change in this scenario; it is always $1.6\times 10^{-19}\ C$.