Figure shows a solid metal sphere of radius a surrounded by a concentric thin metal shell of radius 2a. Initially both are having charges Q each, When the two are connected by a conducting wire as shown in the figure, then amount of heat produced in this process will be :

Two conducting shells of radius a and bare connected by conducting wire as shown in figure. The capacitance of this system is :

A solid conducting sphere of radius 10 cm is enclosed by a thin metallic shell of radius 20 cm . A charge q = 20 mu C is given to the inner sphere is connected to the shell by a conducting wire.

Consider two concentric metalic shell's of radii R and 2R. The inner shell is having charge Q and outer shell is uncharged. If they are connected with a conducting wire. Then,

A solid conducting sphere of radius a having a charge q is surrounded by a concentric conducting spherical shell of inner radius 2a and outer radius 3a as shown in figure. Find the amount of heat porduced when switch is closed (k=1/(4piepsilon_0))

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.

A spherical metal shell A of radius R_A and a solid metal sphere B of radius R_B(ltR_A) are kept far apart and each is given charge '+Q' . Now they are connected by a thin metal wire. Then