Electromagnetic wave travels with speed of 2.0 × 108 m/s in any medium of relative permeability (µr) 1.5. Find the relative permittivity of the medium (∈r)
Answer & explanation
Correct answer: option 2
Refractive Index $ n = \frac{c}{v} = 1.5$
$ n^2 = \mu_r \epsilon_r$
$ \epsilon_r = \frac{n^2}{\mu_r} = \frac{1.5^2}{ 1.5} = 1.5$