Magnitude of an Electric Field in a Cylinder

[freddy13]

Homework Statement

A thin, cylindrical copper shell of diameter ds = 2 cm has along its axis a thin metal wire of diameter dw = 7.50 x 10-03 cm. (as shown in the diagram below.) The wire and the shell carry equal and opposite charges of 6.35 x 10-09 C/cm, distributed uniformly. What is the magnitude of the electric field at a point r = 2.30 mm, where r is measured radially from the center of the inner wire?

Homework Equations

I think EA = E*2*∏*r*L = (λ*L)/ε₀

 

[darkxponent]

Use Gauss law here. Flux = Q(in)