In an arrangement of two concentric conducting shells, with centre at origin and radii a and b(a < b), charges Q1 and Q2 are given to inner and outer shell, then the potential V at a distance r from the origin is (r < a)
A) kQ1/A + kQ2/b
B) KQ1/r + kQ2/a
C) KQ1/a + KQ2/r
D) k(Q1+Q2)/r

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