Why coloumb law is only valid for point charges ?
Answers
It is however not valid for moving charges. This is because the information about the position of the charge (the field caused by the charge) can only travel at the speed of light. ... The "traditional" form of Coulomb's law, explicitly the force between two point charges.
It’s an idealization. In fact it’s arguable whether there are effectively any point charges in practice - electrons do behave like point particles in very high-speed collisions, but at everyday energies quantum effects smear them into fuzzy blobs, the size of, well, atoms, because that’s how atoms get their size. But on experimental scales much larger than atoms, electron are typically good approximations to point charges again, and behave according to Coulomb’s law. And if you know how a point charge behaves, you can easily generalize to an arbitrary charge distribution.
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