Is the induced charge on the surface of metal or inside it ?

A small sphere of radius $r_{1}$ and charge $q_{1}$ is enclosed by a spherical shell of radius $r_{2}$ and charge $q_{2} .$ Show that if $q_{1}$ is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge $q_{2}$ on the shell is.

When the charge is considered as point ?

What type of charges are obtained on silk cloth and glass rod ?

When a conducting soap bubble is negatively charged then