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Coulomb's Law
$$\begin{align}
F_{e}=\frac{k \times (q_{1}\times q_{2})}{r^{2}} \\
\end{align}
$$
$$\begin{align}
F_{e} = \text{the electric force acting between the two objects (of charge)} (N) \\
k = \text{constant of proportionality} = 9.00 \times 10^{9} (N \ m^{2} \ C^{-2})(\text{rearrange formula})\\
q_{1}, q_{2} = \text{the charges on the two charged objects} (C) \\
r (d) = \text{ the distance between the two objects} (m)
\end{align}
$$
- Remember that force is a vector quantity!
One Coulomb is a "serious amount of charge".
- Be prepared for micro, milli, nano Coulombs. Prefixes are on data sheet!