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The quantity conserved by the continuity equation is

  • A.magnetic flux
  • B.electromagnetic energy
  • C.the vector potential
  • D.electric charge

Answer: D

The equation says that current out of a closed surface equals the rate of decrease of the charge within, which is conservation of charge in local form. Energy has its own conservation statement in Poynting's theorem, which is the subject of a separate topic.

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