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Coulomb's Law

$$\begin{align} F_{e}=\frac{k \times (q_{1}\times q_{2})}{r^{2}} \\ \end{align} $$ $$\begin{align} F_{e} = \text{the electric force acting between the two objects (of charge)} (N) \\ k = \text{constant of proportionality} = 9.00 \times 10^{9} (N \ m^{2} \ C^{-2})(\text{rearrange formula})\\ q_{1}, q_{2} = \text{the charges on the two charged objects} (C) \\ r (d) = \text{ the distance between the two objects} (m) \end{align} $$

funny Called after someone $\implies$ capitalised unit, with exception of Litres!

One Coulomb is a "serious amount of charge".