Sign of the Charge & Inverse Square Law: Consider three charges q1, q2, and q3 placed along a straight line (so that this is a one-dimensional problem). Assume that one of the charges q1 is free to move around (so that it accelerates if there is a net force acting on it), whereas the other can be held in place at any location (and are thereby unresponsive to forces in this circumstance, though they otherwise would be). In what configuration should you place the charges so that q1 remains still if: 1. q2 = q3 2. q2 = q3 3. q2 = 4q3 4. q2 = 4q3