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The dielectric constant of air is 1.006. The speed of Electromagnetic Wave travelling in air is $a × 10^8 ms^{-1}$, where a is about |
3 3.88 2.5 3.2 |
3 |
For an Electromagnetic Wave (in vacuum), $Velocity \, c =\frac{1}{\sqrt{\mu_0ε_0}}= 3 × 10^8 ms^{-1}$ Air acts almost as vacuum, hence $a = 3(approx)$ |
