Duduli

Answer:- It consists of a number of mica sheets arranged one above the other  in such a way that there is a mica sheet in between  every two copper plates.Alternate copper plates are connected to terminals A & B. This way different condensers get connected in parallel with each other.Thus net capacity of the capacitor is equal to the sum of the individual capacities.

Answer:- It is based on the principle that when, an earthed conductor is placed in the neighbourhood of a charged conductor, the capacity of the system increases considerably.