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The skin depth in a good conductor is 4um at a frequency of 200kHz , calculate the velocity of EM wave in free space?

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Your Answer

Vp = c / sqrt(us*es) (1) here,
Vp = phase velocity (m/s)
c = speed of light in vacuum 
(m/s) = 2.99792458e8 (m/s)
(Footnote 1) us = relative permeability of medium
es = relative dielectric constant of medium
 vph = c0 = 299,792,458 

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