1. A parallel plate capacitor has 3 dielectrics with relative permittivities of 5.5, 2.2 and 1.5 respectively.
The area of each plate is 100cm2 and thickness of each dielectric 1mm.
•Calculate the stored charge in the capacitor when a potential difference of 5000V is applied across the composite capacitor so formed.
•Calculate the potential gradient developed in each dielectric of the capacitor
2. An air capacitor has two parallel plates 10cm2 in area and 0.5 cm apart. When a dielectric slab of area 10cm2 and thickness o.4 cm was inserted between the plates, one of the plates has to be moved by 0.4 cm to restore the capacitance.
•What is the dielectric constant of the slab?