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) ?ow at rates of 5 × 1015 /s and 10×1015 /s, respectively. Evaluate the current flowing in the direction from B to A.