What is Coulomb's law?
{{Electromagnetism}} [[File:Coulomb.jpg|thumb|220px|right|Charles Augustin de Coulomb]] '''Coulomb's law''' is a [[function]] developed in the 1780s by physicist [[Charles-Augustin de Coulomb]]. It explains how strong the [[force]] will be between two [[electrostatic]] charges. Electrostatic means electric charges without any motion. == Direction == [[Image:CoulombsLaw.svg|thumb|right|300px|This picture shows how Coulomb's Force act; similar charges pushing against each other and opposite charges attract each other]] Let's think of two [[electric charge]]s existing in an empty space. If the two charges are opposite, (+) and (-) charges for example, they will attract each other. And if two charges are both the same, both (+) or both (-) for example, they will push each other. This is similar to how [[magnet]]s act, as N and S attract each other, and as N and N, S and S push each other. This is because electric charges make an [[electric field]]. If two fields exist in the same space at the same time, then the two fields exert (~ put) force on each other. The force they make on each other is called 'Coulomb's force' or the '''electrostatic force'''. Coulomb's law explains how big the force will be. == Scale == Coulomb's law explains the scale between two [[electric charge]]s. The scale of electrostatic force follows the function below. :<math>F = {K_c}rac{q_1q_2}{r^2}</math> Coulomb's law explains that the force scale F is relative to ratio of <math>q_1,q_2</math>,<math>rac{1}{r^2}</math>. <math>q_1</math> and <math>q_2</math> are the scales of each electric charge. <math>r</math> is the distance between the two electric charges. And <math>K_c</math> has a certain value. It does not change relative to <math>q_1</math>, <math>q_2</math> or <math>r</math>. While <math>{K_c}</math> remains constant, when multiples of <math>q_1</math> and <math>q_2</math> become bigger, the '''electrostatic force''' will also get bigger. When the distance <math>r</math> becomes bigger, the electrostatic force will become smal