A metal ball of radius `R` is placed concentrically inside hollow metal sphere of inner radius `2R` and outer radius `3R`.The ball is given a charge `+2Q` and the hollow sphere a total charge `-Q` .The electrostatic potential energy of this system is

A hollow conducting sphere of inner radius r and outer radius 2R is given charge Q as shown in figure, then the

A conducting sphere of radius R and a concentric thick spherical shell of inner radius 2R and outer radius 3R is shown in figure. A charge +10Q is given to the shell and inner sphere is earthed. Then charge on inner sphere is

A conducting sphere of radius R and a concentric thick spherical shell of inner radius 2R and outer radius 3R is shown in figure. A charge +10Q is given to the shell and inner sphere is earthed. Then charge on inner sphere is

An siolated metal sphere of radius 'r' is given a charge 'q' . The potential energy of the sphere is

If Q charge is given to a sphere of radius R, the energy of the system is

A point charge q is placed inside a conducting spherical shell of inner radius 2R and outer radius 3R at a distance of R fro the centre of the shell. The electric potential at the centre of shell will (potential at infinity is zero).

A point charge q is placed inside a conducting spherical shell of inner radius 2R and outer radius 3R at a distance of R fro the centre of the shell. The electric potential at the centre of shell will (potential at infinity is zero).

A_(1) is a spherical conductor of radius (r) placed concentrically inside a thin spherical hollow conductor A_(2) of radius (R). A_(1) is earthed and A_(2) is given a charge +Q then the charge on A_(1) is -

A solid conducting sphere of radius R is surrounded by a concentric metallic shell of inner radius 2R and outer radius 3R. The shell is earthed. The inner sphere is connected to a switch S by a thin conducting wire through a small hole in the shell. By closing the switch S, the inner sphere is connected to a distant conducting sphere of radius R having charge Q. Find the charge that flows to earth through wire AB.