Difference between revisions of "Relative Permittivity"

Latest revision as of 15:14, 7 September 2019

Relative Permittivity is the ratio of the Permittivity of a medium compared to the Permittivity of Free Space.

Relative permittivity of a medium is denoted with the Greek letter epsilon followed by a subscript of r (\(\varepsilon_r\)).

Relative permittivity has no units.

When an electrostatic field propagates through a medium which is not the vacuum the permittivity of that medium is given by the product of its relative permittivity and the permittivity of free space.

\(\varepsilon=\varepsilon_r\varepsilon_0\)

Therefore

\(\varepsilon_r=\dfrac{\varepsilon}{\varepsilon_0}\)

@@ Line 8: / Line 8: @@
 ===Equation===
-The '''permittivity''' of a [[medium]] is the [[product]] of
+: When an [[Electrostatic Field|electrostatic field]] propagates through a [[medium]] which is not the [[vacuum]] the [[permittivity]] of that [[medium]] is given by the product of its '''relative permittivity''' and the [[Permittivity of Free Space|permittivity of free space]].
+<math>\varepsilon=\varepsilon_r\varepsilon_0</math>
+Therefore
+<math>\varepsilon_r=\dfrac{\varepsilon}{\varepsilon_0}</math>
+===Example Media===
+{| class="wikitable"
+|-
+| style="height:20px; width:200px; text-align:center;" |[[Medium]]
+| style="height:20px; width:200px; text-align:center;" |'''Relative Permittivity'''
+|-
+| style="height:20px; width:200px; text-align:center;" |Air
+| style="height:20px; width:200px; text-align:center;" |1.00054
+|-
+| style="height:20px; width:200px; text-align:center;" |Glass
+| style="height:20px; width:200px; text-align:center;" |4.7
+|-
+| style="height:20px; width:200px; text-align:center;" |Water (at 0°C)
+| style="height:20px; width:200px; text-align:center;" |88
+|-
+| style="height:20px; width:200px; text-align:center;" |Steam (at 100°C)
+| style="height:20px; width:200px; text-align:center;" |55
+|}