Que no 12
Series or parallel combination!!?
How do we decide that??!

12. Two conducting spheres of radii R1 and R2 are kept widely separated from each other. What are their individual capacitances? If the spheres are connected by a metal wire, what will be the capacitance of the combination? Think in terms of series-parallel connections.
 

Dear Student , 

The combination is necessarily parallel.
Hence Ceq = 4πε0R1 +4πε0R2 = 4πε0(R1 + R2
Regards

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