Electrostatic:- It is a branch of physics that deals with the phenomena and properties of stationary or slow-moving electric charges with no acceleration.Coulomb’s Law:- It states that the electro-static force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and varies inversely as the square of the distance between the two bodies.F = Kq1q2/r2
Here, K = 1/4πε0 = 9×109 Nm2C-2 (in free space).

Relative Permittivity (εr):-The relative permittivity (εr) of a medium is defined as the ratio between its permittivity of the medium (ε) and the permittivity (ε0) of the free space. εr = ε/ε0 Coulomb force in vector form:- The force on charge q1 due to q2 is,If q1q2>0, R.H.S is positive. Dielectric constant:- The dielectric constant (εr) of a medium can be defined as the ratio of the force between two charges separated by some distance apart in free space to the force between the same two charges separated by the same distance apart in that medium. So, εr = ε/ε0 = F1/F2. Here, F1 and F2 are the magnitudes of the force between them in free space and in a medium respectively.

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