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The Poynting vector is defined as

  • A.\( \mathbf{E} \times \mathbf{H} \)
  • B.\( \mathbf{E} \cdot \mathbf{H} \)
  • C.\( \tfrac{1}{2}\epsilon E^2 + \tfrac{1}{2}\mu H^2 \)
  • D.\( \mathbf{D} \times \mathbf{B} \)

Answer: A

The cross product of the two field intensities has the units of watts per square metre and represents the power crossing unit area. Its surface integral over a closed surface is the total power leaving the enclosed volume.

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