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The magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them. The force is along the straight line joining them. If the two charges have the same sign the electrostatic force between them is repulsive; if they have different signs the force between them is attractive. In the equilibrium stateholds even within atoms correctly describing the force between the positively charged atomic nucleus and each of the negatively charged electrons. This simple law also correctly accounts for the forces that bind atoms together to form molecules and for the forces that bind atoms and molecules together to form solids and liquids. Generally as the distance between ions increases the force of attraction and binding energy approach zero and ionic bonding is less favorable. As the magnitude of opposing charges increases energy increases and ionic bonding is more favorable. Coulombs law or Coulombs inversesquare law is an experimental law of physics that quantifies the amount of force between two stationaries electrically charged particles. The electric force between charged bodies at rest is conventionally called electrostatic force or Coulomb force. The quantity of electrostatic force between stationary charges is always described by Coulombs law. The law was first published in 1785 by French physicist Charles-Augustin de Coulomb and was essential to the development of the theory of electromagnetism maybe even its starting point because it was now possible to discuss quantity of electric charge in a meaningful way.