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(C) In an electromagnetic wave propagating in a vacuum,the electric field vector $\vec{E}$ and the magnetic field vector $\vec{B}$ are always perpendi

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perpendicular to each other and in phase

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(C) In an electromagnetic wave propagating in a vacuum,the electric field vector $\vec{E}$ and the magnetic field vector $\vec{B}$ are always perpendicular to each other.Furthermore,they are both perpendicular to the direction of wave propagation.The relationship between the magnitudes of these fields is given by $E = cB$,where $c$ is the speed of light.Since the fields oscillate with the same frequency and reach their maximum and minimum values at the same time and position,they are said to be in phase.Therefore,the vectors $\vec{E}$ and $\vec{B}$ are perpendicular to each other and in phase.

The vectors $\vec{E}$ and $\vec{B}$ of an electromagnetic wave in vacuum are

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