Is coulomb's law in electrostatics valld in all situations ?

Explanation

Coulomb's law is not applicable in all situations.
It is appliable under the following conditions:
1. The electric charges must be at rest.
(2) The electric charges must be point charges, i.e., size of charges must be smaller than separation between the charges.
3. The separation between the charges must be greater the nuclear size `(10^(-15)m)`, beacuse if distance over the electronstatic forces.