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A capacitor labelled 100 nF and 630 V has its working voltage set by

  • A.the relative permittivity of the dielectric alone
  • B.the capacitance, larger values requiring lower voltages
  • C.the dielectric strength and thickness of its insulation
  • D.the area of the plates rolled inside it

Answer: C

The thickness of the dielectric and its strength together fix the voltage the capacitor withstands, while the area and permittivity fix the capacitance. The two requirements pull against each other, since a thicker dielectric reduces the capacitance for a given area.

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