Learning Goal: To practice Problem-Solving Strategy 20.1 Electric forces and Coulomb's law. Two charged particles, with charges q1=q and q2=4q , are located at a distance d=2cm apart on the x axis. A third charged particle, with charge q3=q , is placed on the x axis such that the magnitude of the force that charge 1 exerts on charge 3 is equal to the force that charge 2 exerts on charge 3. Find the position of charge 3 when q = 2.0 nC . Note that you are given the magnitude of q , but the sign of the charge q is not specified. q can be positive or negative, so that the three charges (q1 , q2 , q3 ) are either all positive charges or all negative charges