Capacitors And Capacitance

A parallel plate capacitor of capacitance is to be constructed by using paper sheets of thickness as dielectric. If the dielectric constant of paper is , the number of circular metal foils of diameter each required for the purpose is

The energy stored in the capacitor as shown in Fig. (a) is . If the battery is replaced by another capacitor of as shown in Fig. (b), then the total energy of system is

In Colpitt oscillator the feedback network consists of

A parallel plate capacitor has capacitance . If it is equally filled the parallel layers of materials of dielectric constant and its capacity becomes . The ratio of and is

The equivalent capacitance of the combination of the capacitors is