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The velocity of electromagnetic waves in...

The velocity of electromagnetic waves in a dielectric medium `(in_(r )= 4, mu_(r ) =4)` is -

A

`3xx10^(8)` metre/second

B

`1.5xx10^(8)` metre/second

C

`6xx10^(8)` metre/second

D

`7.5xx10^(7)` metre/second

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The correct Answer is:
D
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