I was reading a chapter on Capacitors in which it was asked that if there are 2 spheres, each carrying a charge q and of radius r and 2r, then will charge flow. I assume the answer should be no as both are having the same charge(that is what I learned in electrostatics that charge redistributes in such a way that charges become equal).But the book says that charge will flow. My friend told me that their potential will become equal.But why will their potential become equal (if it does)?