The ratio of the amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to
A
the speed of light in vacuum
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B
reciprocal of speed of light in vacuum
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C
the ratio of magnetic permeability to the electric susceptibility of vacuum
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D
unity
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Solution
The correct option is B reciprocal of speed of light in vacuum The amplitude of magnetic field and electric field for an electromagnetic wave propagating in vacuum are related as E0=B0c where, c = speed of light in vacuum. ∴B0/E0 = 1/c