Figure shows two concentric conducting shells of radii `r_(1)` and `r_(2)` carrying uniformly distributed charges `q_(1)` and `q_(2)`, respectively. Find an expression for the potential of each shell.
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Explanation

The potential of each sphere consists of two points : one due to its own charge, and the other due to the charge on the other sphere. Using the principle of superposition, we have
`V_1 = V_(r_(1), "surface") + V_(r_(2), "inside")`
and `V_2 = V_(r_(1), "outside") + V_(r_(2), "surface")`
Hence,
`V_1 = (1)/(4 pi epsilon _0) q_(1)/r_(1) + (1)/(4 pi epsilon_0) q_(2)/r_(2)`
and `V_2 = (1)/(4 pi epsilon_0)q_(1)/r_(2)+(1)/(4 pi epsilon_0)q_(2)/r_(2)`.