Question: Q. 7. Write the expression for speed of electromagnetic waves in a medium of electrical permittivity $\varepsilon$ and magnetic permeability $\mu$. U [Foreign I, II, III 2017]
Solution:
Ans. Formula
$$ \begin{equation*} c=\frac{1}{\sqrt{\mu \varepsilon}} \tag{1} \end{equation*} $$
Alternatively,
$$ \begin{equation*} c=\frac{1}{\sqrt{\mu_{0} \mu_{r} \varepsilon_{0} \varepsilon_{r}}} \tag{1} \end{equation*} $$
[CBSE Marking Scheme 2017]
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