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Relationship between the phase and group velocity in a conducting medium

  1. Aug 30, 2012 #1
    Is the relation [itex]v_{\varphi }v_{g}=v^{2}=\frac{1}{\mu \varepsilon }[/itex] always true in a plasma ?
    Where [itex]v_{\varphi }[/itex], [itex]v_{g}[/itex] are respectively the phase and group velocity of the electromagnetic wave that is propagating in the plasma.
  2. jcsd
  3. Sep 4, 2012 #2
    I said in a plasma but it could be in any conducting medium.
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