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Two thin conducting shells of radii R an...

Two thin conducting shells of radii R and 3R are shown in the figure. The outer shell carries a chage 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 th 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

By closing the switch the capacitance of the system increases.

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