List of top Physics Questions on electrostatic potential and capacitance asked in JCECE

A parallel plate air capacitor has a capacitance $C$. When it is half filled with a dielectric of dielectric constant $5$, the percentage increase in the capacitance will be :

27 small drops each having charge q and radius r coalesce to from big drop. How many times charge and capacitance will become?

What is equivalent capacitance of the network? Each capacitor has $ \text{1}\,\text{ }\!\!\mu\!\!\text{ F} $ capacitance:

The two capacitors $ {{\text{C}}_{\text{1}}} $ and $ {{\text{C}}_{\text{2}}} $ are charged to potentials $ {{\text{V}}_{1}} $ and $ {{\text{V}}_{2}} $ and then connected in parallel. There will be no flow of energy, if: