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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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