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  4. 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?

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Q. 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?Physics Question Image

Electrostatic Potential and Capacitance

Solution:

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$V_{P}=\frac{k q}{x}+\frac{K Q}{x}=0$
$q=-Q$