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True or false: the capacitance of an arrangement depends on the voltage applied to it.

  • A.True, but only above the dielectric strength of the medium
  • B.False, the value being fixed by geometry and permittivity alone
  • C.True, larger voltages producing larger capacitance
  • D.True, since the charge rises with the voltage applied

Answer: B

Capacitance is the ratio of charge to voltage and both rise together, so the ratio is fixed by geometry and permittivity alone. Only if the dielectric is nonlinear, as some ferroelectric ceramics are, does the capacitance depend on the applied voltage.

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