Permittivity of free space: Difference between revisions
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The permittivity of free space, ε0, is a physical constant used often in electromagnetism, and is the capability of a vacuum to permit electric fields. It is also connected to the energy stored within an electric field and capacitance.
It has a value of 8.8542 x 10-12 F/m (farads per meter),[1] and is defined as:[2]
where
is the permeability of free space and
is the speed of light.
It is used to relate two charges separated by a distance to the force between them, simply known as the Coulomb force. It does so in the following way:[2]
where
is the Coulomb force,
and
are two charges, and
is the separation between the charges.
References
- ↑ WolframResearch. (August 27, 2015). Permittivity of Free Space [Online], Available: http://scienceworld.wolfram.com/physics/PermittivityofFreeSpace.html
- ↑ 2.0 2.1 Hyperphysics. (August 27, 2015). Electric and Magnetic Constants [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html