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Coulomb's constant is a proportionality factor that appears in Coulomb's law as well as in other electric-related formulas. Denoted ke{\displaystyle k_{\text{e}}}, it is also called the electric force constant or electrostatic constant hence the subscript e{\displaystyle e}. When the electromagnetic theory is expressed in the International System of Units, force is measured in newtons, charge in coulombs and distance in meters. Coulomb's constant is given by ke=14πε0{\textstyle k_{\text{e}}={\frac {1}{4\pi \varepsilon _{0}}}}. The constant ε0{\displaystyle \varepsilon _{0}} is the vacuum electric permittivity (also known as "electric constant") in C2⋅m−2⋅N−1{\displaystyle \mathrm {C^{2}\cdot m^{-2}\cdot N^{-1}} }. It should not be confused with εr{\displaystyle \varepsilon _{r}}, which is the dimensionless relative permittivity of the material in which the charges are immersed, or with their product εa=ε0εr{\displaystyle \varepsilon _{a}=\varepsilon _{0}\varepsilon _{r}}, which is called "absolute permittivity of the material" and is still used in electrical engineering.

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