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In a medium with relative permittivity 1...

In a medium with relative permittivity 1 and relative permeability 4, the speed of light is

A

`0.5 xxx 10^8 m/s`

B

`1.5 xxx 10^8 m/s`

C

`2 xxx 10^8 m/s`

D

`1 xxx 10^8 m/s`

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