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
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Therefore, the ratio of the amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in a vacuum is equal to the reciprocal of the speed of light.
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2. Reciprocal of speed of light in vacuum
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