Please read this topic first. I have recently seen a proof (using Gauss' law) showing that there is no electrical field inside a charged metallic conductor (due to the carge on its surface). (i can provide this proof if needed) If that proof was right, then this must mean that the inner sphere in the original question (see the link at the begining of the post) will not be charged. So, will or won't be the inner sphere get charged ? Thanks in advance.