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
A. the speed of light in vacuum
B. reciprocal of the speed of light in a vacuum
C. the ratio of magnetic permeability to electric susceptibility in vacuum
D. unity
Answer:B
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
A. the speed of light in vacuum B. reciprocal of the speed of light in a vacuum C. the ratio of magnetic permeability to electric susceptibility in vacuum D. unity