Answer :

Radius of the outer shell = r1


Radius of the inner shell = r2


Charge on the inner surface of the outer shell = Q


Charge on the outer surface of the inner shell = -Q


Potential difference between the two shells,



Where, = Absolute Permittivity of free space = 8.8510-12C2N-1m-2


Since, Capacitance,




Hence, proved.


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