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The figure given below shows two conducting thin concentric shells of radii $r$ and $3r$. The outer shell carries charge $q$. Inner shell is neutral. Find the charge that will flow from inner shell to earth after the switch S is closed.

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$(C) \;+ \large\frac{q}{3}$
Hence C is the correct answer.
answered Jun 10, 2014 by meena.p
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