Question

how can we define the dielectric constant? what is its physical significance?

Answer 1

Dielectric constant of the medium is the ratio of the electrostatic force of interaction between two given point charges held certain distance apart in vacuum/air to the force of interaction between the same two charges held the same distance apart in the material medium. F₀/F_m=ε/ε₀=K……………………………………………(from Coloumb’s law)

Physical significance of dielectric constant is the resistivity to stop the current or conduct electricity through material but induces charge on it in electrostatic.