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Question

Two concentric spheres of radii r1 and r2 carry charges q1 and q2 respectively. If the surface charge density (σ) is the same for both the spheres, the electric potential at the common centre will be

A
σϵ0×r1r2
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B
σϵ0×r2r1
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C
σϵ0(r1r2)
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D
σϵ0(r1+r2)
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