Several pith balls are suspended by nylon string of negligible mass. ball b is negatively charged. ball a attracts ball b. ball a repels ball c. which statement about the charges on the other balls is true? a) ball a is negatively charged. b) ball a is neutral. c) ball c is positively charged. d) ball c is neutral.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.