Consider a solid conducting sphere with a radius $0\mathrm{.}9$ cm and charge $3\mathrm{.}8$ pC on it$.$ There is a conducting spherical shell concentric to the sphere, with radii $2\mathrm{.}3$ cm and $4\mathrm{.}7$ cm and net charge of $28\mathrm{.}1$ pC $.$ Denote the charge on the inner surface of the shell by Q$2$ and that on the outer surface of the shell by Q$$