In the region far from the source,how are the oscillating electric and magnetic field vectors of an electromagnetic wave oriented?

  • A
    Mutually perpendicular and with a phase difference between them.
  • B
    Mutually perpendicular and in the same phase.
  • C
    In the same direction and in the same phase.
  • D
    In the same direction but with a phase difference of $90^o$.

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