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## Homework Statement

A long, straight wire has a linear charge density of magnitude 3.6nC/m. The wire is to be enclosed by a thin, no-conducting cylinder of ouside radius 1.5cm, coaxil witht he wire. The cylinder is to have positive charge on its outside surface with a surface charge density [tex]\sigma[/tex] such that the net external electric field is zero. Calculate the required [tex]\sigma[/tex].

## Homework Equations

[tex]E=\frac{\lambda}{2\pi \epsilon_0 r}[/tex]

## The Attempt at a Solution

The electric field can be found, but then how do I go about finding the required [tex]\sigma[/tex] value?

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