The speed of electromagnetic waves in a material medium is given by (Symbols have their usual meanings)
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → $v = (μ\, ε)^{-0.5}$
The speed of electromagnetic waves in a material medium is given by
$v = \frac{1}{\sqrt{\mu \varepsilon}}$
where
$\mu$ = permeability of the medium,
$\varepsilon$ = permittivity of the medium.