An experimenter conducts several trials during she varies the potential difference between 2 plates to detect a 2.0 g ball that no longer hangs vertically between the plates. With each trial after the path the ball becomes stationary, the experimenter measure the angle of deflection from vertical as the diagram below. For the trial above the potential difference between the plates was 17V. a) electrical force acting on the wall b) electrical field between the plates C) the net charge on the ball