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An electrolytic capacitor achieves a large capacitance in a small volume chiefly through

  • A.an extremely thin oxide dielectric
  • B.a dielectric of very high relative permittivity
  • C.a very large plate area obtained by rolling
  • D.operation at a much higher voltage than other types

Answer: A

The anodised oxide layer is a fraction of a micrometre thick, and since capacitance goes inversely with thickness that is where the gain comes from. The polarity must be respected, because reversing it destroys the oxide and the capacitor with it.

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