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The Poynting vector of a plane wave points

  • A.along the electric field of the wave
  • B.along the magnetic field of the wave
  • C.at right angles to the direction of propagation
  • D.along the direction of propagation

Answer: D

Being the cross product of the two fields, it is perpendicular to both and therefore along the axis of travel, and its magnitude is the power per unit area carried. The detailed treatment of energy flow belongs to the following topic.

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