Basic SE, Hydrogen atom I'm given the basicc equation for the effective potential I've worked out the bohr radius (a) Q. Describe what happens to the effective potential for orbital angular momentum l>0 and electron radius r < r(min) r(min) = l(l+1)a I'm thinking that the effective potential will become positive which would indicate that the electron will repel but am having a hard time seeing how positives and negatives can repel. My answer (2nd year exam). Would probably be. The effective potential will become positive which indicates a negative charge is repelled by a postive one. This is not a physically possible solution,.