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A solid conducting sphere with radius R is concentric with a very thin insulating shell of...

A solid conducting sphere with radius R is concentric with a very thin insulating shell of radius 2R. Sphere
carries charge Q on its surface. Same amount of charge is present on the surface of shell also. Charge is
distributed uniformly over the insulating shell. Find the electric Öeld for the regions:
(i) 0 < r < R, (ii) R < r < 2R, and (iii) r > 2R.

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