Question

Explain why coulumb's law is not an universal law?

Answer 1

Coulomb's law only works for a point charge, and not for all charge distributions. As it only works in certain situations (as does Ohm's Law), then it is not universal. A universal law will work in any situations.

Reference https://www.physicsforums.com/threads/coulombs-law-universal-or-not.223564/

Answer 2

Coulamb's law of electrostatics is only applicable for stationary charge and also doesn't hold true for celestial objects as universal gravitational law does hold true for planets (it exists between planets) as well as for electrons (hence gravitational law is universal)