A parallel plate capacitor having a plate separation of is charged by connecting it to a supply. The energy density is
Important Questions on Capacitor and Capacitance
and are concentric conducting spherical shells of radius and , respectively. is surrounded by a concentric-dielectric medium of inner radius outer radius and dielectric constant If the sphere is given a charge the potential at the outer surface of the dielectric is
Two metallic bodies separated by a distance are given equal and opposite charges of magnitude . The component of the electric field along the line , between the plates, varies as to , where (in meters) is the distance from one body towards the other body as shown.
If each capacitor is of capacity , find the capacitance between and .
Four condensers are joined as shown in the adjoining figure. The capacity of each is . The equivalent capacity between the points and will be