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

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For an electromagnetic wave propagating in vacuum, the relationship between the amplitude of the electric field E₀ and the amplitude of the magnetic field B₀ is given by the equation E₀ = c B₀ , where c is the speed of light in vacuum. The ratio of the amplitude of the magnetic field to the amplitude of the electric field is B₀ E₀ = 1 c . Since c = 1 ₀ ₀ , the ratio B₀ E₀ is the reciprocal of the speed of light in vacuum. Answer: reciprocal of speed of light in vacuum