Vaah terminator,, tune toh forum expert ko bhi nahi baksha!! nice..

Yups ,, now answering seriously,, the question stated by u,, itself states dat the spheres are kept at a wide distance,, their interaction will be minimum , so while calculating their individual capacitances, the interaction of the other wont be considered ,, or as earlier quoted dat ,, it can be considered dat the other capacitor lies at infinite distance,, their individual capacitances become and ..

What was hard in this?/  But the question would have been tricky if u would have asked,, that what will be capacitance of the system ,, if they are joined by any conductor(or medium made conducting),, then after calculating individual capacitances ,, the connection would be like two parallel capacitors ,,, so simply add them..

I would add that,, yes if distance would have been finite,,, then one has to consider induction and calculation of interaction energy would have been done by conformal mapping....

maza aaya... rate me quick..