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An engineer neglects the displacement current when analysing a circuit at 50 Hz and obtains the right answer. This is because

  • A.the circuit contains no capacitors
  • B.the conduction current dominates utterly in the conductors
  • C.the displacement current cancels round the circuit
  • D.Maxwell's equations reduce to the static ones at low frequency

Answer: B

In the conductors the ratio of displacement to conduction current is of order ten to the minus seventeen, so ignoring it costs nothing. Inside a capacitor's dielectric the situation is reversed and the displacement current is all there is, which circuit theory handles as the capacitor's current.

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