Electric field of a plane... | Electromagnetic Waves JEE Main 2021

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JEE-MAIN 2021

01-09-2021 S2

Question

Electric field of plane electromagnetic wave propagating through a non–magnetic medium is given by $E=20 \cos \left(2 \times 10^{10} t-200 x\right) V / m$ The dielectric constant of the medium is equal to : (Take μr = 1)

Select the correct option:

A

9

B

2

C

$\frac{1}{3}$

D

3

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Solution

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