Q82 / 120 · NEET 2012 (Mains) · Physics

The ratio of 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
Correct answer
B
reciprocal of speed of light in vacuum
C
the ratio of magnetic permeability to the electric susceptibility of vacuum
D
unity

Solution

As $E=c B$ So required ratio $\frac{E}{B}=c$ $$ \frac{B}{E}=\frac{1}{c} $$ Therefore, the ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to reciprocal of speed of light.

Hence, the correct answer is option: 'B'.

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