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Electri field of a plane electromagnetic...

Electri field of a plane electromagnetic wave propagating through a non - magnetic medium is given by `E = 20 cos (2 xx 10^10t - 200x) V//m`. The dielectric constant of the medium is equal to :
(Take `mu_r =1`)

A

2

B

`(1)/(3)`

C

9

D

3

Text Solution

Verified by Experts

The correct Answer is:
C
`v = (omega )/( x) = (20 xx 10^(10))/( 20 xx 10^(2)) = 10^(8) m//s `
`n = (C)/( v) = (3 xx 10^(8))/(10^(8)) = 3 = sqrt(mu _(r) epsilon_(r)) ( mu_(r) = 1 " given ")`
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