3 Concentric spherical shells

Three concentric metallic spherical shells of radii R , 2R , 3R ,are given charges Q1 , Q2 ,Q3 respectively . It is found that the surface charge densities on the outer surfaces of the shells are equal. Then ,the ratio of the charges given to the shells, Q1 : Q2 : Q3 , is

1:8:18 1:3:5 1:4:9 1:2:3

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