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[" 61/ Two concentric spheres of radii "R" and r hav "],[" charges with equal surface charge densitic "],[" What is the electric potential at their "],[" centre? "],[[" (1) "sigma/ varepsilon_(0)," (4) None of the "],[" (3) "(sigma)/(varepsilon_(0))(R+r)," (4) None of the "],[62" .Three charges "2q,-9,-9" are located at the "]]

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