Question

Give the situation when coulombs law in electrostatic is not valid

Answer 1

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The statement that the "Coulomb's law is applicable to only stationary electric charges" is true. This is because in case of moving charges, there is a current, which generates magnetic field that in turn exerts force on moving charges, therefore we no longer consider Coulomb's Force alone.

Can we apply Coulomb's law to any type of charge distribution?

The "traditional" form of Coulomb's law, explicitly the force between two point charges. ... Hence, in distribution of charges, we can't apply Coulomb's law. If a charge is uniformly distributed over a line, a surface or a volume, you can easily calculate the force due to it on a point charge using integration.

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