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Relative Permittivity

The \(\textit{relative permittivity}\) of a material under given conditions reflects the extent to which it concentrates electrostatic lines of flux. In technical terms, it is the ratio of the amount of electrical energy stored in a material by an applied voltage, relative to that stored in a vacuum. Likewise, it is also the ratio of the capacitance of a capacitor using that material as a dielectric, compared to a similar capacitor that has a vacuum as its dielectric. Relative permittivity is a dimensionless number that is in general complex. The imaginary portion of the permittivity corresponds to a phase shift of the polarization P relative to E and leads to the attenuation of electromagnetic waves passing through the medium.

\(\epsilon_r(w) = \frac{\epsilon(w)}{\epsilon_O}\)\ where \(\epsilon_r(w)\) is the complex frequency-dependent absolute permittivity of the material, and \(\epsilon_O\) is the vacuum permittivity.

0.000000000008854187817

http://dbpedia.org/resource/Relative_static_permittivity

http://en.wikipedia.org/wiki/Relative_permittivity?oldid=489664437

http://en.wikipedia.org/wiki/Relative_static_permittivity?oldid=334224492

http://www.ncert.nic.in/html/learning_basket/electricity/electricity/charges%20&%20fields/absolute_permittivity.htm

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