Simplify the following text for a Grade 9 native English-speaking person.
Original: Coulomb 's law , or Coulomb 's inverse square law , is a law of physics describing the electrostatic interaction between electrically charged particles . It was studied and first published in 1783 by French physicist Charles Augustin de Coulomb and was essential to the development of the theory of electromagnetism .
Simplified: Coulomb 's law is a function developed in the 1780s by physicist Charles Augustin de Coulomb .