A) the speed of light in vacuum
B) reciprocal of speed of light in vacuum
C) the ratio of magnetic permeability to the electric susceptibility of vacuum
D) unity
Correct Answer: B
Solution :
| As \[E=cB\] |
| 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. |
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