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(D) The speed of an electromagnetic wave in a medium is given by the formula $v = \frac{c}{\sqrt{\mu_r \varepsilon_r}}$,where $c$ is the speed of ligh

Vedclass · Accepted Answer

$1.8 	imes 10^8 \ m/s$

Vedclass · Answer

(D) The speed of an electromagnetic wave in a medium is given by the formula $v = \frac{c}{\sqrt{\mu_r \varepsilon_r}}$,where $c$ is the speed of light in vacuum $(3 	imes 10^8 \ m/s)$,$\mu_r$ is the relative permeability,and $\varepsilon_r$ is the relative permittivity.Given: $\mu_r = 1.3$ and $\varepsilon_r = 2.14$.Substituting the values:$v = \frac{3 	imes 10^8}{\sqrt{1.3 	imes 2.14}}$$v = \frac{3 	imes 10^8}{\sqrt{2.782}}$$v \approx \frac{3 	imes 10^8}{1.668}$$v \approx 1.8 	imes 10^8 \ m/s$.Therefore,the correct option is $D$.

Electromagnetic waves travel in a medium which has relative permeability $1.3$ and relative permittivity $2.14$. Then the speed of the electromagnetic wave in the medium will be

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