1. (a) The charge that passes through any cross section is the product of the current and time. Since t= 4.0 min = (4.0 min)(60 s/min) = 240 s, q= it= (5.0 A)(240 s) = 1.2×103C. (b) The number of electrons Nis given by q= Ne, where eis the magnitude of the charge on an electron. Thus, N= q/e= (1200 C)/(1.60 ×10–19C) = 7.5 ×1021.
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