1. The problem statement, all variables and given/known data 2 particles of charge q and -2q are located as shown in http://s966.photobucket.com/albums/ae146/acherentia/ . A third charge Q is placed on the x axis and it is found that the total electric force on Q is zero. In which region of the figure is Q located? 2. Relevant equations Coulomb's Law 3. The attempt at a solution F1 + F2 = 0 F1(q on Q) = ? F2(-2q on Q) = ? What exactly does it mean a charge of -2q? Is it the same as the charge of 2 electrons?