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The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to:

1. the speed of light in vacuum
2. reciprocal of speed of light in vacuum
3. the ratio of magnetic permeability to the electric susceptibility of vacuum
4. unity

Correct answer: reciprocal of speed of light in vacuum

Solution

For an electromagnetic wave in vacuum, the ratio of the amplitude of the magnetic field to the amplitude of the electric field is equal to the reciprocal of the speed of light (1/c). This follows from the relationship between electric and magnetic fields in electromagnetic waves.

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