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The direction of propagation of a plane wave is given by

  • A.the magnetic field vector alone
  • B.the sum of the two field vectors
  • C.the cross product of the electric and magnetic field vectors
  • D.the electric field vector alone

Answer: C

The cross product is the Poynting vector, whose direction is that of energy flow and hence of propagation. The three vectors form a right-handed set, which fixes the orientation of the magnetic field once the electric field and the direction are known.

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