MCQ
Two identical air filled parallel plate capacitors are charged to the same potential in the manner shown by closing the switch S. If now the switch S is opened and the space between the plates is filled with a dielectric of relative permittivity εr​, then:

  • A
    The potential difference as well as charge on each capacitor goes up by a factor εr​.
  • B
    The potential difference as well as charge on each capacitor goes down by a factor εr.
  • C
    The potential difference across A remains constant and the charge on B remains unchanged.
  • D
    The potential difference across B remains constant while the charge on A remains unchanged.

Answer

  1. The potential difference across A remains constant and the charge on B remains unchanged.

Explanation:

After switch S is opened, as the Capacitor A is connected across the battery, its potential difference is fixed at steady state (i.e., when capacitor is fully charged).

Capacitor B is isolated, so its charge gets fixed. But as we insert the dielectric, its capacitance changes, thus its potential difference also changes.

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