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A long straight wire has fixed negative charge with a linear charge density of magnitude 3.2...

A long straight wire has fixed negative charge with a linear charge density of magnitude 3.2 nC/m. The wire is to be enclosed by a coaxial, thin-walled, nonconducting cylindrical shell of radius 2.0 cm. The shell is to have positive charge on its outside surface with a surface charge density σ that makes the net external electric field is zero. Calculate σ.

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Answer #1

The surface charge density is given by

= lemda / 2pi r

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