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Electromagnetic duality

  1. Apr 28, 2012 #1
    What is electromagnetic duality for Maxwell's equations in free space without sources?
    Is this symmetry valid when there are conventional sources? If not, what hypothetical additional sources are needed to restore duality symmetry?
     
  2. jcsd
  3. Apr 28, 2012 #2
    magnetic monopoles.
     
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