Charges A, B, and C are arrayed along the y axis, with 9A = -3.90 nC, B = 2.70 nC, and qc = 5.20 nC (see figure below). The distance between charges A and B is y = 1.00 m, and the distance between charges B and C is y = 2.80 m. Y Y2 9A qB 9c (a) What is the net electrostatic force on charge A? magnitude N direction downward (b) What is the net electrostatic force on charge B? magnitude N direction upward (c) What is the net electrostatic force on charge C? N magnitude direction downward