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True or false: Poynting's theorem is an additional postulate beyond Maxwell's equations.

  • A.False, the theorem following directly from the curl equations
  • B.True, energy conservation having to be assumed separately
  • C.True, the theorem requiring the constitutive relations as well
  • D.True, since it involves the conductivity of the medium

Answer: A

It follows entirely from the four equations together with the constitutive relations, by a vector identity and a substitution. That energy conservation should emerge without being assumed is one of the theory's strongest recommendations.

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