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Four concentric conducting spherical she...

Four concentric conducting spherical shells P, Q, R and S of radii a, 2a, 3a and 4a respectively. Shell P and S are given charges q and `-q` respectively. If shell R is grounded then potential difference (VP — VR) is (where V, and VR are potential at surfaces of P and R respectively)

A

`q/(12 pi epsilon_0 a)`

B

`q/(6 pi epsilon_0 a)`

C

`q/(24pi epsilon_0 a)`

D

`q/(16 pi epsilon_0 a)`

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