A plane electromagnetic wave travels in free space. Then the ratio of the magnitudes of electric and magnetic fields at a point is equal to:

inverse of the velocity of the electromagnetic wave

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inverse of the energy of electromagnetic wave

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velocity of electromagnetic wave

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energy of electromagnetic wave

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Solution

The correct option is C velocity of electromagnetic wave
Let the electric field and magnetic field of an electromagnetic waves be $E$ and $B$ respectively.
Using $E = B v$ $⟹ v = \frac{E}{B}$
Thus the ratio of electric and magnetic field at a point is equal to velocity of electromagnetic wave.

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