Coulomb's law

In vacuum this law will be 

In Medium 

Since force is vector quantity, therefore coulomb's law

  In vector form 

When charge distribution is uniform over the body, then the charge Q of coulomb's law will be 

Characteristic of coulomb's law

> It follow inverse square law

   >   It follow Newton's 3rd law of motion. 

>          It is central by nature. 

     >  Force is repulsive if charges       are  like or F=+ve and Force is attractive if charges are unlike or F=ve. 

Important fact for numerical

1 when the separation between the charge increases N times keeping charges fixed then the force between them decrease square of N times

2                 Concept of NULL POINT

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