law of attraction and repulsion between electrostatic charges
Coulomb's law Coulomb's law, or Coulomb's inverse-square law, is a law of physics that describes force interacting between static electrically charged particles. In its scalar form, the law is:
Coulomb's constant Coulomb's constant, the electric force constant, or the electrostatic constant (denoted ke, k or K) is a proportionality constant in electrodynamics equations. In SI units, it is exactly equal to 7009898755178736817♠8987551787.3681764 N·m2·C−2, or roughly equaling 7009899000000000000♠8.99×109 N·m2·C−2. It was named after the French physicist Charles-Augustin de Coulomb (1736–1806) who introduced Coulomb's law.