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Inserting a dielectric slab that fills the space between the plates of a capacitor

  • A.multiplies the capacitance by the square of the relative permittivity
  • B.multiplies the capacitance by the relative permittivity
  • C.divides the capacitance by the relative permittivity
  • D.leaves the capacitance unchanged

Answer: B

For the same voltage the polarised medium allows more charge to be held, so the capacitance rises in proportion to the permittivity. This is the main reason dielectrics are used at all, the second being mechanical separation of the plates.

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