Coulomb's law

Coulomb's law provides an expression for the force, $\mathbf {F} _{12}$, between two charges, Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle q_1 q_2 } , and is given by

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \mathbf{F}_{12} = \frac{1}{4\pi\varepsilon_0} \frac{q_1q_2(\mathbf{r}_1 - \mathbf{r}_2) }{ |\mathbf{r}_1 - \mathbf{r}_2|^3} }

where Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \varepsilon_0} is the electric constant, which has the value 8.854187817x10^-12 Fm^-1

References

Interesting reading

• Isobel Falconer "Charles Augustin Coulomb and the fundamental law of electrostatics", Metrologia 41 pp. S107-S114 (2004)