A solid, infinitely long, non-conducting cylindrical shell of outer radius 2R and inner radius R is charged uniformly with volume charge density p. Let r be the radial distance from the center of the shell to an arbritary point.
Find electric field for r
Find e field for R
Find e field for r>2R
Write expression for potential difference b/w inner & outer shell
Assume shell is now conducting with same total charge. How does e field & potential difference change?