Question

what do you mean by relative permittivity?

Answer 1

Definition of relative motion. 1 : motion as observed from or referred to some material system constituting a frame of reference (as two adjacent walls and floor of a room) — see relativity sense 3. 2 : the motion of one body with respect to another regarded as fixed — compare relative velocity.
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Answer 2

Relative permittivity is the factor by which the electric field between the charges is decreased relative to vacuum. Likewise, relative permittivity is the ratio of the capacitance of a capacitor using that material as a dielectric, compared with a similar capacitor that has vacuum as its dielectric.

Dielectric Constant or Relative Permittivity is a material property that affects the Coulomb force between two point charges in the material. Relative permittivity is the factor by which the electric field between the charges is decreased relative to vacuum.

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