Two spherical conductors A and B of radii a and b (`b gt a`) are placed concentrically in air. A is given charged +Q while B is earthed. Then the equivalent capacitance of the system is

Two spherical conductor A and B of radii a and b ( bgta ) are placed concentrically in air. The two are connected by a copper wire as shown in figure. The equivalent capacitance of the system is

Two spherical conductors A_(1) and A_(2) of radii r_(1) and r_(2) are placed concentrically in air. The two are connected by a copper wire as shown in figure. Then, the equivalent capacitance of the system is

Two spherical conductors A_(1) and A_(2) of radii r_(1) and r_(2) are placed concentrically in air. The two are connected by a copper wire as shown in figure. Then, the equivalent capacitance of the system is

A and B are two concentric spherical shells. If A is given a charge +Q while B is earthed as shown in figure then

A and B are two concentric spherical shells. If A is given a charge +q while B is earthed as shown in figure then

A and B are two concentric spherical shells. If A is given a charge +q while B is earthed as shown in figure then

Two spherical conductors A and B of radii R and 2R respectively are each given a charge Q. When they are connected by a metallic wire. The charge will