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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

`1/3`

B

`2`

C

3

D

9

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