Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Relative Permittivity (εr) or Dielectric Constant
Definition, Formula
Dielectric characteristics of a material is determined by its dielectric constant. It is a measure of polarisation in dielectrics.
RELATIVE PERMITTIVITY (εr) or DIELECTRIC CONSTANT
Dielectric characteristics of a material is determined by its dielectric constant. It is a measure of polarisation in dielectrics.
Definition
It is the ratio of absolute permittivity of the medium (ε) and permittivity of free space (ε0).
Dielectric constant εr = Absolute Permittivity (ε) / Permittivity of free space (ε0)
εr = ε / ε0
Since dielectric constant is the ratio of same quantity, it is a dimensionless quantity and it has no unit.
The value of ε r= 1 for air or vacuum. Dielectric constant is also called as relative permittivity.
Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation : Tag: : Definition, Formula - Relative Permittivity (εr) or Dielectric Constant
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Physics for Electrical Engineering
PH3202 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation