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Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectrostatic Potential and Capacitance1 Mark
Question
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 $ε_{r​},$ then:
✓

Answer

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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