I was reading a chapter on capacitors where it was asked whether given two spheres, each carrying a charge $q$ and of radius $r$ and $2r$, will charge flow between them?
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)?