Permeability of free space - Revision history

Jmdonev: 1 revision imported

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energy>Jmdonev at 18:54, 29 July 2026

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	<onlyinclude>The '''permeability of free space''', '''μ<sub>0</sub>''', is a physical constant used often in [[electromagnetic force\|electromagnetism]]. It is defined to have the exact value of 4π x 10<sup>-7</sup> N/A<sup>2</sup> ([[newton]]s per [[ampere]] squared).<ref name=hyp>Hyperphysics. (August 28, 2015). ''Electric field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html</ref> It is connected to the [[energy]] stored in a [[magnetic field]]</onlyinclude>, see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html#c1 Hyperphysics] for specific equations.		<onlyinclude>The '''permeability of free space''', '''μ<sub>0</sub>''', is a physical constant used often in [[electromagnetic force\|electromagnetism]]. It is defined to have the exact value of 4π x 10<sup>-7</sup> N/A<sup>2</sup> ([[newton]]s per [[ampere]] squared).<ref name=hyp>Hyperphysics. (August 28, 2015). ''Electric field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html</ref> It is connected to the [[energy]] stored in a [[magnetic field]]</onlyinclude>, see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html#c1 Hyperphysics] for specific equations.

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	==References==		==References==
	{{reflist}}		{{reflist}}
			[[category: Uploaded]]

Jmdonev: 1 revision imported: Doing upload, largely of old redirects.

2018-06-04T16:52:21Z

1 revision imported: Doing upload, largely of old redirects.

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Jmdonev at 23:07, 31 May 2018

2018-05-31T23:07:55Z

← Older revision		Revision as of 23:07, 31 May 2018
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	<onlyinclude>The '''permeability of free space''', '''μ<sub>0</sub>''', is a physical constant used often in [[electromagnetic force\|electromagnetism]]. It is ~~taken~~ to have the exact value of 4π x 10<sup>-7</sup> N/A<sup>2</sup> ([[newton]]s per [[ampere]] squared).<ref name=hyp>Hyperphysics. (August 28, 2015). ''Electric field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html</ref> It is connected to the [[energy]] stored in a [[magnetic field]]</onlyinclude>, see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html#c1 Hyperphysics] for specific equations.		<onlyinclude>The '''permeability of free space''', '''μ<sub>0</sub>''', is a physical constant used often in [[electromagnetic force\|electromagnetism]]. It is defined to have the exact value of 4π x 10<sup>-7</sup> N/A<sup>2</sup> ([[newton]]s per [[ampere]] squared).<ref name=hyp>Hyperphysics. (August 28, 2015). ''Electric field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html</ref> It is connected to the [[energy]] stored in a [[magnetic field]]</onlyinclude>, see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html#c1 Hyperphysics] for specific equations.

	It is related to the [[speed of light]] by the equation		It is related to the [[speed of light]] by the equation:

	<center><m>c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}</m></center>		<center><math>c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}</math></center>

	where		where

	*<m>c</m> is the [[speed]] of [[light]] and		*<math>c</math> is the [[speed]] of [[light]] and
	*<m>\epsilon_0</m> is the [[permittivity of free space]].		*<math>\epsilon_0</math> is the [[permittivity of free space]].

			A magnetic field, <math>B</math> in a region of space has field energy associated with it. That [[energy density]] is defined as:<ref>Jackson, John David (1998). Classical Electrodynamics (3rd ed.). New York: Wiley. p. 213</ref>
			<center>Energy <math>= \frac{B^2}{2 \mu_0} </math></center>


			One particular use is the [[magnetic force]]. The constant gives how strong the [[force]] is between two [[electric current]]s separated by a distance:<ref name=hyp/>

			<center><math>F = \frac{I_1 I_2}{2 \pi \mu_0 r} </math></center>

			where

			*<math>F</math> is the Magnetic force,
			*<math>I_1</math> and <math>I_2</math> are two currents, and
			*<math>r</math> is the separation between the [[wire]]s carrying the currents.

	Visit [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html Hyperphysics] for more information on this constant.		Visit [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html Hyperphysics] for more information on this constant.

			== For Further Reading ==
			For further information please see the related pages below:
			*[[Permittivity of free space]]
			*[[Magnetic field]]
			*[[Magnetic flux]]
			*[[Inductance]]
			*Or explore a [[Special:Random\|random page]]

	==References==		==References==
	{{reflist}}~~[[Category:Uploaded]]~~		{{reflist}}
	~~[[category: Mark edit]]~~

J.williams: 1 revision imported

2015-09-18T16:51:26Z

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Jmdonev at 20:08, 17 September 2015

2015-09-17T20:08:30Z

← Older revision		Revision as of 20:08, 17 September 2015
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	[[Category:Done 2015-09-05]]		[[Category: Done 2015-09-06]]
	<onlyinclude>The '''permeability of free space''', '''μ<sub>0</sub>''', is a physical constant used often in [[electromagnetic force\|electromagnetism]]. It is taken to have the exact value of 4π x 10<sup>-7</sup> N/A<sup>2</sup> ([[newton]]s per [[ampere]] squared).<ref name=hyp>Hyperphysics. (August 28, 2015). ''Electric field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html</ref> It is connected to the energy stored in a [[magnetic field]]</onlyinclude>, see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html#c1 Hyperphysics] for specific equations.		<onlyinclude>The '''permeability of free space''', '''μ<sub>0</sub>''', is a physical constant used often in [[electromagnetic force\|electromagnetism]]. It is taken to have the exact value of 4π x 10<sup>-7</sup> N/A<sup>2</sup> ([[newton]]s per [[ampere]] squared).<ref name=hyp>Hyperphysics. (August 28, 2015). ''Electric field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html</ref> It is connected to the [[energy]] stored in a [[magnetic field]]</onlyinclude>, see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html#c1 Hyperphysics] for specific equations.

	It is related to the [[speed of light]] by the equation		It is related to the [[speed of light]] by the equation
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	where		where

	*<m>c</m> is the speed of light and		*<m>c</m> is the [[speed]] of [[light]] and
	*<m>\epsilon_0</m> is the [[permittivity of free space]].		*<m>\epsilon_0</m> is the [[permittivity of free space]].

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	==References==		==References==
	{{reflist}}		{{reflist}}[[Category:Uploaded]]
			[[category: Mark edit]]

J.williams: 1 revision imported

2015-09-03T18:22:35Z

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Jmdonev at 20:16, 28 August 2015

2015-08-28T20:16:41Z

New page

[[Category:Done 2015-09-05]]
<onlyinclude>The '''permeability of free space''', '''μ0''', is a physical constant used often in [[electromagnetic force|electromagnetism]]. It is taken to have the exact value of 4π x 10-7 N/A2 ([[newton]]s per [[ampere]] squared).<ref name=hyp>Hyperphysics. (August 28, 2015). ''Electric field'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html</ref> It is connected to the energy stored in a [[magnetic field]]</onlyinclude>, see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/engfie.html#c1 Hyperphysics] for specific equations.

It is related to the [[speed of light]] by the equation

<center><m>c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}</m></center>

where

*<m>c</m> is the speed of light and
*<m>\epsilon_0</m> is the [[permittivity of free space]].

Visit [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html Hyperphysics] for more information on this constant.

==References==
{{reflist}}