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dielectric    
n. 电介体,绝缘体
a. 非传导性的

电介体,绝缘体非传导性的

dielectric
介电质; 绝缘材料 DIELEX

dielectric
电介质

dielectric
n 1: a material such as glass or porcelain with negligible
electrical or thermal conductivity [synonym: {insulator},
{dielectric}, {nonconductor}] [ant: {conductor}]

Dielectric \Di`e*lec"tric\, n. [Pref. dia- electric.] (Elec.)
Any substance or medium that transmits the electric force by
a process different from conduction, as in the phenomena of
induction; a nonconductor, separating a body electrified by
induction, from the electrifying body.
[1913 Webster]


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  • Why does the capacitance of a parallel plate capacitor increase on . . .
    With a dielectric present due to the induced charge (called polarisation) the electric field within the dielectric is reduced but unlike a conductor does not become zero but a similar analysis will show that the charge on the plates of the capacitor must increase to keep the potential difference between the plates constant
  • What is the dielectric constant of a pure conductor?
    Dielectric constant is the ratio of permittivity of a medium to the permittivity of free space How to find dielectric constant of a conductor?
  • What are the conditions under which these equations hold for dielectric . . .
    These equations seem to hold in most cases, but there are exceptions (e g , a dielectric sphere uniformly polarized in a uniform electric field) My textbook tells me that these expressions hold under certain conditions, but it is not clear about the conditions
  • electromagnetism - Dielectric constant or permittivity of metals . . .
    I'm wondering what the dielectric constant or permittivity of metals is --particularly copper Do metals have an infinite permittivity?
  • Surface charge on dielectric interface - Physics Stack Exchange
    As the dielectric constant of the plates are different, I would expect a surface density at the interface of the two dielectric materials I want to calculate this surface charge density I have the following figure in my mind but with two different slabs of dielectrics (area and length are the same)
  • electrostatics - Why is capacitance increased with a dielectric rather . . .
    A dielectric with high permittivity $\varepsilon$ permits (requires) more polarization for a given field magnitude than a low permittivity one More polarization means more charge stored, so the high $\varepsilon$ material must hold more charge for a given field to be measured across it when used as a dielectric in a capacitor
  • Displacement current in a dielectric - Physics Stack Exchange
    Further, this would imply that the equation for net displacement current in a dielectric medium would be $\epsilon_ok \frac {d\phi_E} {dt}$ However, this result doesn't make intuitive sense to me Could someone please explain if there's a problem with my thinking here?
  • Can someone tell me why there are two values for the dielectric . . .
    The relative permeability (or dielectric constant) is a complex number, in this case given by $\epsilon = \epsilon_1 + i\epsilon_2$, related to n and k by: $\epsilon = (n+ik)^2$ Separating real and imaginary parts, it leads to: $\epsilon_1 = n^2 - k^2$, and $\epsilon_2 = 2nk$ You can check those numbers easily to see it matches the data given by the website
  • Conductor-Dielectric Boundary Conditions - Physics Stack Exchange
    2 We have a conductor of resistivity $\rho$ and has a boundary with a dielectric of permittivity $\epsilon$ and we have displacement vector $\vec D$ at an angle $\alpha$ with normal to the boundary and directed from conductor to the dielectric I need to find the conductor's surface charge density and current density in the vicinity of the





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