NEETPhysicsElectromagnetic WavesMCQ+4 / −1
If the ratio of relative permeability and relative permittivity of a uniform medium is . The ratio of the magnitudes of electric field intensity to the magnetic field intensity of an EM wave propagating in that medium is (Given that ):
- A
- B
- C
- D
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Correct answer: C
$$\frac{\mu_r}{E_r}=\frac{1}{4}$$
$$\begin{aligned} \frac{E}{H}=\frac{E \mu}{B} & =v \mu \\ =\frac{1}{\sqrt{\mu \varepsilon}} \mu & =\sqrt{\frac{\mu}{\varepsilon}}=\sqrt{\frac{\mu_0 \mu_r}{\varepsilon_0 \varepsilon_r}} \\ & =\sqrt{\frac{\mu_0}{\varepsilon_0}} \sqrt{\frac{\mu_r}{\varepsilon_r}} \\ & =120 \pi\left(\frac{1}{2}\right) \\ & =\frac{60 \pi}{1} \end{aligned}$$
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