If the proton was a perfect sphere with positive charge distributed uniformly over the surface, the [itex]1/r^2[/itex] force would apply only down to the surface (EM force would be 0 inside). But the proton is not a perfect sphere. It is a wave function that has rather fuzzy boundaries. It seems that the existence of the strong nuclear force is based on the assumption that EM repulsion continues to follow the [itex]1/r^2[/itex] relationship to a point that appears to be within that fuzzy boundary.
I am just asking questions. All questions are based on ignorance. Otherwise, why ask the question?
I don't pretend to have more than a rudimentary grasp of quantum theory. I studied it as an undergraduate in physics but that was many years ago. And I ended up as a lawyer.
My question was: What evidence is there that protons repel protons with enormous EM force ([itex]\propto 1/r^2[/itex]) that continues down to the 'surface of the proton'.