NEET UG PHYSICS MCQ: ELECTROMAGNETIC WAVES

1 Easy

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Application +4 | -1

Electromagnetic waves travel in a medium with speed of

1.5 \times 10^8 \mathrm{~ms}^{-1}

. The relative permeability of the medium is 2.0 . The relative permittivity will be :

View answer and explanation

Correct option: D

Option C (4) is correct because the refractive index

n = c/v = \sqrt{\mu_r \epsilon_r}

, and solving for

\epsilon_r

gives

\epsilon_r = (c/v)^2 / \mu_r

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{E_X}

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{E_2} = {E_{02}}\hat x\cos \left[ {k\left( {2z - ct} \right)} \right]

{\varepsilon _{{r_1}}}

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E = 50\sin \,(500x - 10 \times {10^{10}}t)\,v/m.

c

\mathrm{\varepsilon }

\mathrm{\mu }

\sqrt {\frac{\mathrm{\mu }}{\mathrm{\varepsilon }}}