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Three concentric metallic spherical shel...

Three concentric metallic spherical shells of radii R, 2R, 3R are given charges `Q_(1) Q_(2) Q_(3)`, respectively. It is found that the surface charge densities on the outer surface of the shells are equal. Then, the ratio of the charges given to the shells `Q_(1) : Q_(2) : Q_(3)` is

A

`1:2:3`

B

`1:3:5`

C

`1:4:9`

D

`1:8:18`

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The correct Answer is:
B
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