The ratio of the magnitudes of the electric field to the magnetic field of an electromagnetic wave is of the order of

Question

$10^{-5} \, \text{m s}^{-1}$

$10^8 \, \text{m s}^{-1}$

$10^{-8} \, \text{m s}^{-1}$

$10^5 \, \text{m s}^{-1}$

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