P27 001

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1.

(a) The charge that passes through any cross section is the product of the current and time. Since

4.0 min = (4.0 min)(60 s/min) = 240 s, q = it = (5.0 A)(240 s) = 1200 C.

(b) The number of electrons N is given by q = N e, where e is the magnitude of the charge on an

electron. Thus N = q/e = (1200 C)/(1.60

× 10

19

C ) = 7.5

× 10

21

.


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