AP PHYSICS
posted by Becky .
An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.29*10^.11m. What is the change in EPE(electric potential energy)?
i need help with this problem. please guide me to do it. thanks!

The PE at infinity is zero. THe PE at r is Vq which is equal to q^2/r Watch units.