Question

Two concentric metallic shells of radii R and 2R are placed in vacuum. The inner shell is having charge Q and outer shell is uncharged. If they are connected with a conducting wire, Then

• A. Q amount of charge will flow from inner to outer shell.
• B. number of electrons will flow from outer to inner shell, where 'e' is charge on an electron.
• C. amount of heat is produced in the wire.
• D. amount of heat is produced in the wire.

Answer 1

Answer: (A), (B), (C)

The correct options are
A

Q amount of charge will flow from inner to outer shell.

B

number of electrons will flow from outer to inner shell, where 'e' is charge on an electron.

C

amount of heat is produced in the wire.

(After connection entire charge moves towards outer shell)

Amount of heat produced = loss in electric potential energy = $\frac{K{Q}^2}{2R}-\frac{K{Q}^2}{4R}=\frac{K{Q}^2}{4R}$
$\because Q=nl\Rightarrow n=\frac{Q}{e}$