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The theorem is obtained from Maxwell's equations by forming

  • A.the curl of the sum of the two field intensities
  • B.the dot product of the two flux densities
  • C.the Laplacian of the electric field intensity
  • D.the divergence of the cross product of the two field intensities

Answer: D

Expanding \( \nabla \cdot (\mathbf{E} \times \mathbf{H}) \) by the vector identity and substituting the two curl equations produces the three terms of the theorem directly. It is one of the tidiest derivations in the subject.

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