Two concentric hollow conducting spheres of radius $r$ and $R$ are shown. The charge on outer shell is $Q$. What charge should be given to inner sphere so that the potential at any point $P$ outside the outer sphere is zero?
Easy
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(c)
$V_\rho=\frac{k q}{x}+\frac{K Q}{x}=0$
$q=-Q$
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