(N/A) The limitations of Coulomb's law are as follows:
$1$. It is applicable only for point charges. $A$ point charge is defined as a charge whose size is negligible compared to the distance between them.
$2$. It is valid only when the charges are at rest. If the charges are in motion,additional magnetic forces come into play.
$3$. It is applicable only for distances greater than the nuclear range (i.e.,$r > 10^{-15} \ m$). At distances smaller than this,strong nuclear forces dominate over electrostatic forces.
$4$. It is a fundamental law that holds true for distances ranging from the size of an atom to macroscopic distances.