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Four concentric conducting spherical she...

Four concentric conducting spherical shells A, B, C and D of radii a, 2a, 3a and 4a respectively. Shell B and D are given charges q and `-q` respectively. If shell C is grounded then potential difference (VA — VC) is

A

A. `q/(12 pi epsilon_0 a)`

B

B. `q/(6 pi epsilon_0 a)`

C

C. `q/(24pi epsilon_0 a)`

D

D. `q/(16 pi epsilon_0 a)`

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