“permittivity”的概念、定义、翻译、参考文献-科学参考

permittivity

Physics

Symbol ε‎. The ratio of the electric displacement in a medium to the intensity of the electric field producing it. It is important for electrical insulators used as dielectrics.

If two charges Q₁ and Q₂ are separated by a distance r in a vacuum, the force F between the charges is given by:

$F = Q_{1} Q_{2} / r^{2} 4 {π ε}_{0}$

In this statement of Coulomb’s law using SI units, ε‎₀ is called the absolute permittivity of free space, which is now known as the electric constant. It has the value 8.854×10⁻¹² F m⁻¹.

If the medium between the charges is anything other than a vacuum the equation becomes:

$F = Q_{1} Q_{2} / r^{2} 4 π ε$

and the force between the charges is reduced. ε‎ is the absolute permittivity of the new medium. The relative permittivity (ε‎_r) of a medium, formerly called the dielectric constant, is given by ε‎_r=ε/ε‎₀.

Geology and Earth Sciences

See dielectric constant; dielectric permittivity.

单词	permittivity
释义	permittivity Physics Symbol ε‎. The ratio of the electric displacement in a medium to the intensity of the electric field producing it. It is important for electrical insulators used as dielectrics. If two charges Q₁ and Q₂ are separated by a distance r in a vacuum, the force F between the charges is given by: $F = Q_{1} Q_{2} / r^{2} 4 {π ε}_{0}$ In this statement of Coulomb’s law using SI units, ε‎₀ is called the absolute permittivity of free space, which is now known as the electric constant. It has the value 8.854×10⁻¹² F m⁻¹. If the medium between the charges is anything other than a vacuum the equation becomes: $F = Q_{1} Q_{2} / r^{2} 4 π ε$ and the force between the charges is reduced. ε‎ is the absolute permittivity of the new medium. The relative permittivity (ε‎_r) of a medium, formerly called the dielectric constant, is given by ε‎_r=ε/ε‎₀. Geology and Earth Sciences See dielectric constant; dielectric permittivity.
随便看	bound variable bound–bound transition bound–free transition Bounty mutiny (1789) Bourbaki, Nicolas Bourbon Bourdon gauge bourgeoisie/proletariat Bourguiba, Habib ibn Ali (1903–2000) bourn bourne bournonite bouton Boutros-Ghali, Boutros (1922–2016) Bouwers telescope BOV Boveri, Theodor Heinrich Bovet, Daniel bovine spongiform encephalopathy bow-and-arrow rule Bowell, Sir Mackenzie (1823–1917) Bowen fluorescence Bowen, Ira Sprague Bowen, Ira Sprague (1898–1973) Bowen, Norman Levi (1887–1956)