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Figure shows two conducting thin concent...

Figure shows two conducting thin concentric shells of radi `r` and `3r`. The outer shell carries a charge q. Inner shell in neutral. Find the charge that wilL flow from inner shell to earth the switch S is closed.

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The correct Answer is:
A, C
Let q' be the charge on inner shell when it is earthed.
Potential of inner shell is zero.
`:. 1/(4piepsilon_0)[q'/r+q/(3r)]=0`
`:. q'=-q/3`
i.e. `+q/3` charge will flow from inner shell to earth.
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