2.17 A long charged cylinder of linear charged density is surrounded by a hollow co-axial conducting cylinder. What is the electric field in the space between the two cylinders?
The charge density of the cylinder with length l and radius r =
The radius of another hollow cylinder with same length = R
Now, let our gaussian surface be a cylinder with the same length and different radius r
the electric flux through Gaussian surface
Hence electric field ar a distance r from the axis of the cylinder is