What is Coulomb’s law?
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We know that two oppositely charged objects attract each other and same charged objects repel each other. We can know the value and direction of this force of attraction or repulsion from Coulomb’s law.
Coulomb’s law
The force of attraction or repulsion between two point charges in any given medium is proportional to the product of their charges and proportional to the square of the distance between them. This force acts along their connecting line.
Here many may think, the Coulomb force depends only on charge value and distance. But no. This force also depends on the permeability of the medium in which the charge is contained (air, liquid or any other medium).
However, Coulomb’s force has some limitations. As this force applies only to point charges.