1. The problem statement, all variables and given/known data I wanted to know how the charges knew their distance from each other. 2. Relevant equations f=k(q1*q2)/r^2 3. The attempt at a solution I think it has something to do with the electric field lines that each charge outputs. But I'm curious as to what these lines do once they hit another field line. Do they send information back and let the charge know that there is a like or opposite charge a some position? opposite = attract like=repel I know f=qE E=(kq)/r Why does the distance determine the force on a charge and not something else?