Coulomb's law 库仑定律
(重定向自Coulomb interaction)
      
Coulomb's law or Coulomb's inverse-square law, is a law of physics that describes force interacting between static electrically charged particles. In its scalar form the law is: 
where ke is Coulomb's constant (ke  = 7009899000000000000♠8.99×10 N m C), q1 and q2 are the signed magnitudes of the charges, the scalar r is the distance between the charges. The force of interaction between the charges is attractive if the charges are opposite signed and repulsive if like signed.