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The energy in a plane wave in free space is divided between the two fields

  • A.equally at every instant
  • B.with the electric field carrying the greater share
  • C.with the magnetic field carrying the greater share
  • D.in the ratio of the intrinsic impedance to unity

Answer: A

Substituting the impedance relation into the two energy density expressions shows them to be equal, which is a satisfying symmetry hidden by the very different numerical values of the fields. The total density is therefore twice either one.

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