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## Homework Statement

A thin insulating rod with charge density lambda=+5nC/m is arranged inside a thin conducting cylindrical shell of radius r =3 cm. The rod and the shell are on the same axis, and infinite in length.

What is electric field at point p? 6cm from the central axis.

## Homework Equations

Gauss's law : E*dA = Qenc/epsilon

## The Attempt at a Solution

The question before this was actually to find the sigma.. which was 26.526nC/m^2. So I used sigma in the gauss's law. E*dA( area of cylindrical wall) = (sigma*A)/epsilon and got 2998. However, the answer was exactly the half of that(1499) ... Why?