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Redistribution of Charges Between Concentric Shells



Redistribution of charges for concentric spherical shells where one shell is grounded

Two concentric spheres of radius R and 2R have charges Q and 2Q. The potential at a point P situated at a point 3R/2 distance from common centre is V, Now if outer sphere is earthed, the potential at point P is:
Before earthing,the potential at P,
After earthing the outer sphere, potential at P,