Hey Guys , just try to understand !!

What do u mean by the phrase "seperated by a long distance " ?

If that means that the distance between them is infinity then  there is no qn of interaction , we have simply two non-interacting metal spheres whose total capacitances are simply the sum of their individual capacitances .

But if they are seperated by finite distance ( say d ) then I must admit that the situation is really bad !!

If anybody can calculate for finite seperation  using class XII approach , I myself would give him 10 hats !!

Promise !!