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Electromagnetic waves travel in a medium which has relative permeability `1.3` and relative permittivity `2.14`. Then the speed of the electromagnetic wave in the medium will be

A

`13.6 xx10^(6) m//s`

B

`1.8xx10^(2) m//s`

C

`3.6 xx10^(8) m//s`

D

`1.8xx10^(8) m//s`

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