1.COULOMB'S LAW OF ELECTROSTATIC FORCE :-Force of attraction or repulsion between two charged things is directly proportional to the product of their charges and inversely proportional to the square of the distance between them, according to Coulomb’s law. It acts along the line that connects the two charges that are regarded to be point chargesCoulomb’s Law Formula (Scalar Form)As we know, the force (F) between two point charges q1 and q2 separated by a distance r in a vacuum is,Proportional to the product of the charges.F is proportional to q1q2Inversely Proportional to the square of the distance between them,F is inversely proportional to 1/r2F is proportional to q1q2 / r2then,F = k q1q2 / r2where,k is proportionality constant and equals to 1/4πε0.Value of k is 9 × 109 Nm^2/ C^2Symbol ε0 is permittivity of a vacuum equal to8.854 × 10^-12 C^2 N^-1 m^-2.2. Applications of Coulomb’s Law:-Coulomb’s Law is one of the basic laws of Physics. It is used for various purposes, some of its important applications are discussed below,It is used to calculate the distance and force between the two charges.It is used to arrange the charges in stable equilibrium.Columbus law is used to calculate electric field.3. Limitations of Coulomb’s Law:-There are some limitations of Coulomb’s Law which are discussed below in the article,A. Coulomb’s Law is applicable for the point charges which are at rest.B. Coulomb’s Law is only applicable in situations where the inverse square law is followed.C. Coulomb’s Law is applicable only for the charges which are considered to be spherical. For charges with arbitrary shapes, Coulomb’s Law is not applicable because we cannot determine the distance between the chargesI am explaining this video on the behalf of Navneet sharma sir