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\noindent which corresponds to $l=3\times10^{13}~\rm{cm}$ and a timescale $\tau=l/v\sim4\times10^5~\rm{s}\sim5~\rm{days}\sim0.01~\rm{years}$.  \subsection{Part b} b \textit{following Meredith MacGregor}}  The Coulomb force between an electron and proton is (in cgs/Gaussian units):  \begin{equation}  F_c=\frac{e^2}{r^2}  \end{equation}  \subsection{Part c}