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The retarded potentials express the fields at a point in terms of the sources

  • A.averaged over a whole period of the oscillation
  • B.at an earlier time, by the travel time of the wave
  • C.at the same instant, wherever they may lie
  • D.at a later time, anticipating their motion

Answer: B

Since no influence travels faster than the wave speed, what happens at a point now depends on what the sources were doing a propagation time ago. The retardation is what turns the static potential expressions into radiating ones and gives rise to antennas.

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