Difference between revisions of "Magnetic constant"
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| − | The '''magnetic constant''' (symbol: '''''μ''<sub>0</sub>'''), also known as the '''vacuum permeability''' or the '''permeability of free space''', is a [[physical constant]] that relates [[force]] to [[magnetic field]] in vacuum. It also appears in Maxwell's equations, which describe the behaviour of [[electromagnetic wave]]s. The exact definition (and value) depends on the system of quantities used, but in the [[International System of Quantities]] (ISQ) | + | The '''magnetic constant''' (symbol: '''''μ''<sub>0</sub>'''), also known as the '''vacuum permeability''' or the '''permeability of free space''', is a [[physical constant]] that relates [[force]] to [[magnetic field]] in [[vacuum]]. It also appears in Maxwell's equations, which describe the behaviour of [[electromagnetic wave]]s. The exact definition (and value) depends on the system of quantities used, but in the [[International System of Quantities]] (ISQ) it has a defined value of exactly {{nowrap|4π{{e|−7}} N A<sup>−1</sup>}} (approximately {{nowrap|12.566 370 614{{e|−7}} N A<sup>−1</sup>}}).<ref name="CODATA">{{CODATA 2006|url=http://physics.nist.gov/cgi-bin/cuu/Value?mu0}}.</ref> |
==References== | ==References== | ||
Revision as of 18:44, 1 April 2010
The magnetic constant (symbol: μ0), also known as the vacuum permeability or the permeability of free space, is a physical constant that relates force to magnetic field in vacuum. It also appears in Maxwell's equations, which describe the behaviour of electromagnetic waves. The exact definition (and value) depends on the system of quantities used, but in the International System of Quantities (ISQ) it has a defined value of exactly 4π × 10−7 N A−1 (approximately 12.566 370 614 × 10−7 N A−1).[1]
References
- ↑ Mohr, Peter J.; Taylor, Barry N.; Newell, David B. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 2008, 80 (2), 633–730. doi:10.1103/RevModPhys.80.633, <http://physics.nist.gov/cuu/Constants/codata.pdf>. Direct link to value.
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