# Electric charge on hollow spherical conducting shells Gauss's Law(?)

There are two spherical hollow conducting shells, one inside the other. The outer shell has a radius 4 times that of the inner shell. There is a switch connecting the two shells, which is for the moment, open. Both shells have a positive charge (inner shell = +20nC and outer shell = +60nC.

When the switch is closed... can someone explain why all the charge moves to the outer shell? The fact that there is a conducting wire (switch) connecting the two spheres makes it confusing for me to apply a Gaussian surface.

Thanks =)