A fixed amount of equal but opposite charge is stored on two…

A fixed amount of equal but opposite charge is stored on two sides of a square-type capacitor with a Pyrex glass as the dielectric material. The initial potential energy stored in the capacitor is U0.  If both the plate diameter and distance between two plates are doubled, what would be the final stored energy?

A rod made of insulating material with a large excess charge…

A rod made of insulating material with a large excess charge is brought close (without touching) to a sphere without any excess charge (i.e., electrically neutral) that is also made of an insulating material.  Will there be a force of attraction between the rod and the sphere?