How do adjust three capacitors to get high energy on same potential

A potential difference of 20V is applied across a parallel combination of three identical capacitors. If the total charge in the combination be 30C, determine the capacitance of each capacitor. What will be the charge in the series combination of these three capacitors with the same potential difference?

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Two capacitors are in parallel and the energy strored is 45 J, when the combination is raised to a potential of 3,000 V. With the same two capacitors in series, the energy is 4.05 J for the same potential. What are their capacitannces?

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Is it possible to charge a capacitor to any high potential at will?

How many percent of work done by a battery is consumed to fully charge a capacitor which is stored as electric potential energy in the capacitor ?

How many percent of work done by a battery is consumed to fully charge a capacitor which is stored as electric potential energy in the capacitor ?