Difference between revisions of "Dictionary:Dielectric constant (ε)"

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<translate>{{#category_index:D|dielectric constant (&#x03B5;)}}
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(d&#x012B;, &#x2202; lek&#x2019; trik) A measure of the capacity of a material to store charge when an electric field is applied. It is the dimensionless ratio of the <b>[[Special:MyLanguage/Dictionary:Capacitivity|capacitivity]]</b> or <b>[[Special:MyLanguage/Dictionary:permittivity|permittivity]]</b>, the ratio of the electrical displacement <b>D</b> to the electric field strength <b>E</b>, of the material to that of free space:  
 
(d&#x012B;, &#x2202; lek&#x2019; trik) A measure of the capacity of a material to store charge when an electric field is applied. It is the dimensionless ratio of the <b>[[Special:MyLanguage/Dictionary:Capacitivity|capacitivity]]</b> or <b>[[Special:MyLanguage/Dictionary:permittivity|permittivity]]</b>, the ratio of the electrical displacement <b>D</b> to the electric field strength <b>E</b>, of the material to that of free space:  
  
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<center><math>\textbf{D}=\varepsilon\textbf{E} </math>.</center>
 
<center><math>\textbf{D}=\varepsilon\textbf{E} </math>.</center>
  
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Also called <b>specific inductive capacity</b>. It is frequency and temperature dependent. Typical values are 1.0 for air, 80 for water, 5-20 for granite, 3-100 for dry-to-moist sand. A <b>complex relative permittivity</b> <math>\varepsilon^\star </math> is sometimes used:  
 
Also called <b>specific inductive capacity</b>. It is frequency and temperature dependent. Typical values are 1.0 for air, 80 for water, 5-20 for granite, 3-100 for dry-to-moist sand. A <b>complex relative permittivity</b> <math>\varepsilon^\star </math> is sometimes used:  
  
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<center><math>\varepsilon^\star=\varepsilon - j \epsilon '</math>,</center>
 
<center><math>\varepsilon^\star=\varepsilon - j \epsilon '</math>,</center>
  
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where <math> \epsilon '</math> is the <b>dielectric loss factor</b>, a measure of the loss of energy through conductivity, polarization currents, etc.
 
where <math> \epsilon '</math> is the <b>dielectric loss factor</b>, a measure of the loss of energy through conductivity, polarization currents, etc.
 
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Latest revision as of 18:58, 13 May 2017

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(dī, ∂ lek’ trik) A measure of the capacity of a material to store charge when an electric field is applied. It is the dimensionless ratio of the capacitivity or permittivity, the ratio of the electrical displacement D to the electric field strength E, of the material to that of free space:

.

Also called specific inductive capacity. It is frequency and temperature dependent. Typical values are 1.0 for air, 80 for water, 5-20 for granite, 3-100 for dry-to-moist sand. A complex relative permittivity is sometimes used:

,

where is the dielectric loss factor, a measure of the loss of energy through conductivity, polarization currents, etc.