A charge, q1 = -6.90C is placed at (0, 30.0 cm) and a second charge, q2 = +8.95C is placed at (40.0 cm, 0). A third charge, Q = -12.1 C, is placed at the origin. a). Determine the electric field at the origin. b). Determine the electric force on Q at the origin. c). Describe what would happen to Q if it were released from rest. In particular, would Q move with constant acceleration, constant velocity, both, neither?