An electricity and magnetism problem by Akanksha Gupta

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 shell are equal. Then, the ratio of the charges given to the shells, Q1:Q2:Q3, is

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

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