Capacitance of sphere A is `4 muF` while of another sphere B, it is 8`muF`. If on sphere A, there is a charge 2 `muc` and on B. the charge is 4 `muc` , then the ratio of potential of the spheres is

The capacitance of a metallic sphere is 1 muF , if its radius is

Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is

A nonuniformly charged ring is kept near an uncharged conducting solid sphere. The distance between their centres (which are on the same line normal to the plane of the ring) is 3m and their radius is 4m. If total charge on the ring is 1muC , then the potential of the sphere will be

A spherical capacitor has an inner sphere of radius 12 cm and an outer sphere of radius 13 cm. The outer sphere is earthed and the inner sphere is given a charge of 2.5 muC . The space between the concentric spheres is filled with a liquid of dielectric constant 32. (a) Determine the capacitance of the capacitor. (b) What is the potential of the inner sphere ? (c) Compare the capacitance of this capacitor with that of an isolated sphere of radius 12 cm.Explain why the later is much smaller ?

A sherical capacitor has an inner sphere of radius 12 cm and an outer spere of radius 13 cm . The outer sphere is earthed, and the inner sphere is given a charge of 2.5 muC . The space between the concentric spjheres is filled with a liquid of dielectric caonstant 32 . Determine the potential of the inner sphere.

In the circuit given below, the charge in muC , on the capacitor having 5 muF is

A spherical capacitor has the inner sphere of radius 2 cm and the outerone of 4 cm . If the inner sphere is earthed and the outer one is charged with a charge of 2muC and isolated. Calculate ltbr. (a) the potential to which the outer sphere is raised. (b) the charge retained on the outer surface of the outer sphere.

Two spheres of radii R_(1) and R_(1) respectively are charged and joined by wire. The ratio of electric field of spheres is

The ratio of the surface area of sphere A to the surface area of sphere B is 729 : 1. What is ratio of the volume of sphere A to sphere B ?

Two isolated metallic spheres of radii 2 cm and 4 cm are given equal charge, then the ratio of charge density on the surfaces of the spheres will be