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Exercise E1 Electron Charge
How many electrons make up the charge of one $\rm Coulomb$?
\begin{align*}
n_{\rm e} = {{1~ \rm C}\over{1.6022 \cdot 10^{-19}~{\rm C / electron} }}
= 6.2 \cdot 10^{18}~{\rm electrons}
\end{align*}