2016年2月18日 · Dielectric constant is proportional to the ratio of polarization density (P) and electric field (E) which means dielectric constant is inversely proportional to electric field. The Electric field (E) inside a conductor is always zero under the static situation so the dielectric constant for conductor is infinite.

The electric constant $\epsilon_0$ was defined as the constant needed to make Gauss's law for electricity and Coulomb's law work for whatever units of length, charge and force you want to choose.

2015年5月25日 · Also, I was wondering what's exactly the physical meaning of the complex dielectric function for metals. For metals it is given as : $$\epsilon_r (\omega) = 1 - \frac{\omega_p^2}{\omega^2 + i \gamma \omega} $$ with $\omega_p$ the plasmafrequency and $\gamma$ a damping factor.

2019年7月3日 · What are the differences between "dielectric constant" and "electrical permittivity"? By searching on the net, I found permittivity = absolute permittivity, which is the measure of capacitance that is encountered when forming an electric field in a particular medium. The lowest permittivity is that of a vacuum: vacuum permittivity = electric ...

2020年8月13日 · In practice, the permittivity of most material is nearly constant over a very large range of bias but if the bias voltage is large enough then it will surely change; after all, it can break down, burn, etc. Electric circuits are designed to operate to take this into account and there are limits beyond which the permittivity can change.

I know that static dielectric constant of vacuum is a unity and there are several values of various well-known materials. However, I cannot find a dielectric constant table of metals. I do not know if this is a reliable reference, but there was a dielectric constant table that showed negative values.

$\begingroup$ The dielectric constant has nothing to do with the insulation properties of the material. One can have a high dielectric constant and a high conductivity. Doped semiconductors tend to have that combination. $\endgroup$ –

The dielectric constant is a measure of the spring constant. A material with a large dielectric constant is made of "stretchy" atoms or molecules. Given a parallel plate capacitor, the capacitance depends on the distance between the plates. Inserting a dielectric effectively adds plates, reducing the separation.

2021年6月10日 · The conductivity provides a current proportional to the applied electric field. This can be factored into a dielectric constant. The real trick, is to imagine why the DC conductivity has anything to do with AC conductivity. For this the the Drude model provides good intuition.

2016年1月9日 · In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. Yes, metals have infinite permittivity as they completely negate the electric field inside their bulk. I.e. infinite resistance to …