Q. A beam containing two types of charged particles is moving from A to B. Particles of type I with charge +3q, and those of type II with charge -2q (where -q is the charge of an electron given by -1.6 × 10-19 C) flow at rates of 5 × 1015/s and 10×1015/s, respectively. Evaluate the current flowing in the direction from B to A.