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Figure shows three concentric thin spher...

Figure shows three concentric thin spherical shells A, B and C. They have radii R, 2R and 3R. The shell B is earthed and A and C are given charges q and 2q respectively. Then, the total charge on B is

A

`-q`

B

`-(4q)/3`

C

`-(7q)/3`

D

`q/3`

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