A solid conducting sphere of radius$$ rA$=10\mathrm{.}03$cm has a surface charge density of$$ A$=-48\mathrm{.}34$Cm$2$ on its surface.$$ A neutral concentric conducting spherical shell of inner radius$$ rB$=30\mathrm{.}2$cm$,$ and outer radius rC$=34\mathrm{.}5$cm surrounds the solid sphere.$$ Determine the charge density on the inner surface of the spherical shell $($in Cm$2).$