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  4. Speed of electromagnetic wave in medium of dielectric constant 2.25 and relative permeability 4 is

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Q. Speed of electromagnetic wave in medium of dielectric constant $2.25$ and relative permeability $4$ is

Solution:

$n =\sqrt{\varepsilon_{r} \mu_{ r }}=\sqrt{4 \times 2.25}=3,$
$ v =\frac{ C }{ n }=\frac{3 \times 10^{8}}{3}=10^{8}$