Figure shows two conducting thin concentric shells of radii \( \mathrm{r} \) and \( 3 \mathrm{r}...

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Figure shows two conducting thin concentric shells of radii \( \mathrm{r} \) and \( 3 \mathrm{r} \). The outer shell carries charge \( \mathrm{q} \) and inner shell is neutral. The amount of charge which flows from inner shell to the earth after the key
P \( \mathrm{K} \) is closed, is equal to :-

W
(A) \( -q / 3 \)
(B) \( q / 3 \)
(C) \( 3 q \)
(D) \( -3 q \)
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