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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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reciprocal of speed of light in vacuum
For an electromagnetic wave,
Speed of electromagnetic wave, $c=\frac{E_0}{B_0}$
$\therefore \frac{B_0}{E_0}=\frac{1}{c}=$ reciprocal of speed
Speed of electromagnetic wave, $c=\frac{E_0}{B_0}$
$\therefore \frac{B_0}{E_0}=\frac{1}{c}=$ reciprocal of speed
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