1. The problem statement, all variables and given/known data An electron orbits a stationary proton at a distance of 5.29 x 10^-11 m. (i) What is the kinetic energy of the electron? (ii) What is the potential energy of the whole system? (iii) What is the minimum amount of energy needed to separate the two charges to infinity? 2. Relevant equations 3. The attempt at a solution Just a simple question: (ii) In this system are there any other forms of potential energy other than the electric potential energy?