Find out the capacitance of an isolated spherical conductor of radius R

Find the expression for the capacitance of an isolated spherical conductor of radius 'r'

Find the capacitance of an isolated spherical conductor of radius a surrounded by a concentric layer of dielectric of outer radius b and relative permittivity. epsi

Find the capacitance of an isolated ball-shaped conductor of radius R_(1) surrounded by an adjacent concentric layer of dielectric with permittivity epsilon and outside radius R_(2) .

The relation between the capacitance of an isolated spherical conductor situated in air and its radius is