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A long straight wire has fixed negative charge with a linear chargedensity of magnitude 3.6 nC/m. The wire is to be enclosedby a coaxial, thin-walled, nonconducting cylindrical shell ofradius 1.5 cm. The shell is tohave positive charge on its outside surface with a surface chargedensity σ that makes the net externalelectric field zero. Calculate σ.

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