Figure shows a solid conducting sphere of radius $1 m$, enclosed by a metallic shell of radius $3 \,m$ such that their centres coincide. If outer shell is given a charge of $6 \,\mu C$ and inner sphere is earthed, find magnitude charge on the surface of inner shell is ............. $\mu C$
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(b)
$V=\frac{k q}{1}+\frac{k 6}{3}=0$
$q=-2 \,\mu C$
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