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Speed of EM Waves in a Medium question from NEET 2024

Q7NEET 2024Medium

Speed of EM Waves in a Medium

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 $\sqrt{\frac{\mu_0}{\varepsilon_0}} = 120\pi$ ):

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Answer: (c)

Wave impedance $\dfrac{E}{H} = \sqrt{\dfrac{\mu}{\varepsilon}} = \sqrt{\dfrac{\mu_0}{\varepsilon_0}}\sqrt{\dfrac{\mu_r}{\varepsilon_r}}$
$\dfrac{E}{H} = 120\pi \times \sqrt{\dfrac{1}{4}} = 60\pi$
So the answer is (c) $60\pi : 1$ .

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