Question 190: EM waves

Question

If the ratio of relative permeability and relative permittivity of a uniform medium is $$1: 4$$. The ratio of the magnitudes of electric field intensity $$(E)$$ to the magnetic field intensity $$(H)$$ of an EM wave propagating in that medium is
(Given that $$\sqrt{\frac{\mu_0}{\varepsilon_0}}=120 \pi$$):

Accepted Answer

$$\frac{\mu_r}{E_r}=\frac{1}{4}$$
$$\begin{aligned}
\frac{E}{H}=\frac{E \mu}{B} & =v \mu \
=\frac{1}{\sqrt{\mu \varepsilon}} \mu & =\sqrt{\frac{\mu}{\varepsilon}}=\sqrt{\frac{\mu_0 \mu_r}{\varepsilon_0 \varepsilon_r}} \
& =\sqrt{\frac{\mu_0}{\varepsilon_0}} \sqrt{\frac{\mu_r}{\varepsilon_r}} \
& =120 \pi\left(\frac{1}{2}ight) \
& =\frac{60 \pi}{1}
\end{aligned}$$

Answer

$$30 \pi: 1$$

Answer

$$1: 120 \pi$$

Answer

$$60 \pi: 1$$

Answer

$$120 \pi: 1$$

EM waves

If the ratio of relative permeability and relative permittivity of a uniform medium is $1: 4. The ratio of the magnitudes of electric field intensity (E) to the magnetic field intensity (H) of an EM wave propagating in that medium is (Given that \sqrt{\frac{\mu_0}{\varepsilon_0}}=120 \pi$):

Choose the correct answer: