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Electric field in plane electromagnetic...

Electric field in plane electromagnetic wave is given by `E=50sin(500x-10xx10^(10)t)V//m`
The velocity of electromagnetic wave in this medium is :
(Given C= speed of light in vacuum)

A

C

B

`(2)/(3)C`

C

`(3)/(2)C`

D

`(C )/(2)`

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