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The velocity of an electromagnetic wave ...

The velocity of an electromagnetic wave in a medium is `2xx10^(8) mS^(-1)` . If the relative permeability is 1 the relative permittivity of the medium is `(C_(0)=3xx10^(8) mS^(-1))`

A

1.25

B

2.25

C

2.5

D

2

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