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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