What is a Coulomb? A coulomb is a unit of electrical charge. Charge is given the symbol Q. Electrons are tiny and have a very small charge. In the physics of electricity, we take a very large number of electrons as 1 unit of charge called a coulomb. 1 coulomb = 6·2 x 10 18 electrons. This is 6·2 million million million electrons.
Coulomb's inverse-square law, or simply Coulomb's law, is an experimental law [1] of physics that calculates the amount of force between two electrically charged particles at rest. This electric force is conventionally called the electrostatic force or Coulomb force. [2] Although the law was known earlier, it was first published in 1785 by French physicist Charles-Augustin de Coulomb. Coulomb ...