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(D) An electromagnetic wave consists of an oscillating electric field vector $\vec{E}$ and a magnetic field vector $\vec{B}$.These vectors oscillate i

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in mutually perpendicular planes but vibrating in phase.

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(D) An electromagnetic wave consists of an oscillating electric field vector $\vec{E}$ and a magnetic field vector $\vec{B}$.These vectors oscillate in mutually perpendicular planes,meaning the electric field is perpendicular to the magnetic field.Furthermore,these fields oscillate in phase,which means they reach their maximum and minimum values at the same time and at the same position in space.Therefore,the correct description is that they vibrate in mutually perpendicular planes but in phase.

Electromagnetic waves consist of periodically oscillating electric and magnetic vectors:

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