Question

In the given arrangement of capacitor one 3uf capacitor has got 600 of energy then the potential difference across 2uf capacitor is

Answer 1

Consider a capacitor of capacity C. When a certain charge is given to it, it is raised through a certain potential. In order to add more charge to it, the new installment of charge has to be brought against the force of repulsion due to the charge already present upon it. Therefore, some work has to be done by the external agency.

The addition of new charge raises, further, the potential of the capacitor. Since, the additional installments of charge brought to the capacitor are against gradually increasing potential, so greater amount of work has to be done. The total work done to increase the charge on a capacitor from zero to a desired value gets stored in it and is known as the potential energy of the capacitor.

capacitor is basically a two terminal electrical component used for storage of energy electrostatically in an electric field. A large variety of capacitors are available but one thing that is common among all is that each capacitor contains at least two electrical conductors which are separated or partitioned by a dielectric insulator. One of the most commonly used capacitor consists of metal foils with a thin layer of insulating film in between. 

The capacitance is at its peak when there is a thin separation between the big areas of conductor and it is due to this that the capacitor conductors are also called plates.