R away from it. Now Coulomb's law will give us some force that this guy feels due to this electron. And then it will also give us the same force, except in negative direction, that this guy feels due to this proton. Now, my question is, how do we get this electron not a distance our way, but a distance to our way? In other words, how do we move this electron from this guy from this distance to this distance? Well, remember, if this is a positive force and this is a negative force, these guys are tracting.