Relationship between the phase and group velocity in a conducting medium

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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.
 

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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.
I said in a plasma but it could be in any conducting medium.
 

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