# Differences

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 phy142:lectures:23 [2014/04/03 16:12]mdawber [Video of lecture] phy142:lectures:23 [2014/04/03 16:13]mdawber [Energy density of a magnetic field] Both sides previous revision Previous revision 2014/04/07 14:38 mdawber [Energy density of a magnetic field] 2014/04/03 16:13 mdawber [Energy density of a magnetic field] 2014/04/03 16:12 mdawber [Video of lecture] 2013/03/29 18:04 mdawber [Video of lecture] 2012/03/23 15:57 mdawber [Video of lecture] 2011/04/09 18:34 mdawber [Lecture 23 - Inductance] 2011/04/05 22:08 mdawber [Lecture 23 - Inductance] 2011/03/30 20:54 mdawber [LR circuits] 2011/03/30 20:54 mdawber created 2014/04/07 14:38 mdawber [Energy density of a magnetic field] 2014/04/03 16:13 mdawber [Energy density of a magnetic field] 2014/04/03 16:12 mdawber [Video of lecture] 2013/03/29 18:04 mdawber [Video of lecture] 2012/03/23 15:57 mdawber [Video of lecture] 2011/04/09 18:34 mdawber [Lecture 23 - Inductance] 2011/04/05 22:08 mdawber [Lecture 23 - Inductance] 2011/03/30 20:54 mdawber [LR circuits] 2011/03/30 20:54 mdawber created Last revision Both sides next revision Line 178: Line 178: $u=\frac{1}{2}\frac{B^{2}}{\mu}$ $u=\frac{1}{2}\frac{B^{2}}{\mu}$ - where $\mu$ is the permeability of the material + where $\mu$ is the permeability of the material. + + This can be compared to the energy density of an electric field + + $u=\frac{1}{2}\varepsilon_{0}E^{2}$ + + or + + $u=\frac{1}{2}K\varepsilon_{0}E^{2}$ + + in a dielectric material with dielectric constant K.
phy142/lectures/23.txt · Last modified: 2014/04/07 14:38 by mdawber