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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]
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
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