# The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to: Option 1) reciprocal of speed of light in vacuum Option 2) the ratio of magnetic permeability to the electric susceptibility of vacuum Option 3) unity Option 4) the speed of light in vacuum

$E_{o}=c.B_{o}$

$\therefore \frac{B_{o}}{E_{o}}=\frac{1}{c}$

Option 1)

reciprocal of speed of light in vacuum

This option is correct.

Option 2)

the ratio of magnetic permeability to the electric susceptibility of vacuum

This option is incorrect.

Option 3)

unity

This option is incorrect.

Option 4)

the speed of light in vacuum

This option is incorrect.

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