Source : Webster's Revised Unabridged Dictionary (1913)

Coulomb's law \Cou`lomb's" law\ (Physics)
   The law that the force exerted between two electric or
   magnetic charges is directly proportional to the product of
   the charges and inversely to the square of the distance
   between them.

Source : WordNet®

Coulomb's Law
     n : a fundamental principle of electrostatics; the force of
         attraction or repulsion between two charged particles is
         directly proportional to the product of the charges and
         inversely proportional to the distance between them;
         principle also holds for magnetic poles