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A parallel plate capacitor has a dielectric slab covering half its area over the whole gap. The arrangement behaves as

  • A.two capacitors in series
  • B.a single capacitor with the geometric mean permittivity
  • C.a single capacitor with the lower of the two permittivities
  • D.two capacitors in parallel

Answer: D

Both parts see the same voltage across the same gap, so their charges add and the capacitances add. Recognising whether a composite arrangement is series or parallel comes down to asking whether the voltage or the flux is shared.

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