In the given figure, a conducting spherical shell of inner radius x and outer radius y is concentric with a larger conducting sphere shell of inner radius a and outer radius b. The inner shell has a total charge
and the outer shell has a total charge
. Let
be the distance of any point from the common centre O.

Column I | Column II | ||
(I) | Electric field strength is zero | (P) | Outer surface of the large spherical shell |
(II) | Electric field strength is non-zero | (Q) | Inner surface of the larger spherical shell |
(III) | Magnitude of charge on this surface is 3Q | (R) | Outer surface of the smaller spherical shell |
(IV) | Charge on the surface is +8 Q | (S) | For |
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