Question: A long, straight wire has a uniform constant charge with linear charge density, -3.60nC/m. The wire is surrounded by a long nonconducting, thin-walled cylindrical shell that is charged on its outside surface, such that the electric field outside the shell is zero. The shell has a radius of 1.50cm.

Part A: What uniform area charge density sigma is needed on the shell for the electric field to be zero outside the shell?

Please, try to give explanation. Thank you.