Two thin conducting shells of radii $R$ and $3R$ are shown in the figure. The outer shell carries a charge $+ Q$ and the inner shell is neutral. The inner shell is earthed with the help of a switch $S$.
Two thin conducting shells of radii $R$ and $3R$ are shown in the figure. The outer shell carries a charge $+ Q$ and the inner shell is neutral. The inner shell is earthed with the help of a switch $S$.
- A
With the switch $S$ open, the potential of the inner sphere is equal to that of the outer.
- B
When the switch $S $ is closed, the potential of the inner sphere becomes zero.
- C
With the switch $S$ closed, the charge attained by the inner sphere is $- q/3$.
- D
all of the above
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