COULOMB'S LAW

                        COULOMB'S LAW 

 It states that the electrostatic force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between the charges. Thus, if q₁ and  q₂ be the two-point charges separated by a distance r, then the force between them is given by 

 Let F be the electrostatic force between these two charges. According to Coulomb's law,

                                                

                                                      

  

 

Where

  where   

                                                                                                                                                               

Coulomb's Law in vector form

 Coulomb's law in terms of the position vector

IMPORTANT POINTS

1. Coulomb's law is not valid for moving charges because moving charges produce a magnetic field also.
2. A charge Q, exert force on a second charge Q₂. If the third charge Q₁ is brought near, the force of Q₂ exerted on Q remains unchanged.
3. Coulomb's law is valid at a distance greater than 10^-15 m.
4. In equilibrium, the net electric force on every charged particle is zero. The equilibrium of a charged particle, under the action of Colombian forces alone, can never be stable. 

5. Decreasing order to fundamental forces F _nuclear > F_{electromagnetic} >F_weak > F_{gravitational}

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