For the charge arrangement shown, qA = -2.0 nC, qB = -1.0 nC, and qc = 3.0 nC. What is the magnitude of the electric force on qB if r = 5.0 cm? A B C (a) 1.3-10-5 N (b) 6.5.10-6 N (c) 3.3-10-6 N (d) 1.6.10-6 N (e) None of the above