Two 11.5-mg balls are connected by a 28.9-cm-long insulating rod of negligible mass. one ball has a charge of +q and the other has a charge of −q. the system is placed in a 592 n/c uniform electric field. initially the system is at rest and makes an angle α= 58.9° with respect to the field. it is then released, and when it is momentarily aligned with the electric field, its kinetic energy is 4.86 mj. what is the magnitude of q?