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Comparing a capacitor charged at constant voltage with one charged at constant charge as a dielectric is inserted, the stored energy

  • A.rises in the first case and falls in the second
  • B.falls in the first case and rises in the second
  • C.rises in both cases
  • D.falls in both cases

Answer: A

At constant voltage the energy is proportional to capacitance and so rises; at constant charge it is inversely proportional and so falls. In both cases the slab is drawn in, because the correct criterion at constant voltage includes the work done by the source and not merely the stored energy.

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