Themes > Science > Physics > Electromagnetism > Electrostatics > Electric charge > Coulomb's Law > Coulomb's Law

From experiments done by Charles Coulomb, the electric force between two stationary charges is given by the following rules:
  • The force is inversely proportion to the square of the distance between the charges.
  • The force is proportional to the product of the magnitudes of the charges.
  • The force is attractive is the charges are of opposite sign and repulsive if the charges are of the same sign.

An expression for the above rules is given as: F = k |Q1||Q2|/R^2, where k = 8.99 x 10^9 N m^2/C^2.


Information provided by: http://www.physics.unc.edu