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True or false: the displacement current produces a magnetic field just as a conduction current does.

  • A.True, both terms appearing on the right of the same Maxwell equation
  • B.False, only moving charge being able to produce a magnetic field
  • C.False, the displacement current being a mathematical device only
  • D.True, but the field it produces is very much weaker

Answer: A

It enters Ampere's law on exactly the same footing as the conduction current, so it produces a magnetic field of the same kind and strength for the same number of amperes. The magnetic field between capacitor plates carrying alternating current is a real and measurable thing.

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