Answer
$6.2\times10^{-11}A$
Work Step by Step
Use the definition of current, equation 18–1.
$$I=\frac{\Delta Q}{\Delta t}$$
$$I=\frac{(1200\;ions)(1.60\times10^{-19}C/ion)}{3.1\times10^{-6}s}=6.2\times10^{-11}A$$
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