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In a series arrangement of two dielectrics between capacitor plates, the larger field appears in the layer of

  • A.higher permittivity
  • B.greater thickness
  • C.greater dielectric strength
  • D.lower permittivity

Answer: D

The normal flux density is common to both layers, so the field intensity is inversely proportional to the permittivity. A thin air gap inside solid insulation therefore carries a much higher field than the solid, which is why voids are the usual starting point of failure.

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