A wire carries a current of 2.0 A. What is the charge that has flowed through its cross–section in 1.0 s. How many electrons does this correspond to?
Answer & explanation
Correct answer: option 2
$ q = it = 2C$
$ n = \frac{Q}{e} = \frac{2}{1.6\times 10^{-19}} = 1.25 \times 10^{19}$