Answer:
Conditions of validity of Coulomb's law. Coulomb's law is not applicable in all situations. It is valid only under the following conditions: 1. The electric charges must be at rest. 2. The electric charges must be point charges i.e., the extension of charges must be much smaller than the separation between the charges. 3. The separation between the charges must be greater than the nuclear size\[({{10}^{-15}}m)\], because for distances \[<{{10}^{-15}}m,\] the strong nuclear force dominates over the electrostatic force.
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