Electric Field due to an Infinite Line

[SalsaOnMyTaco]

Homework Statement

Recalling that the field due to an infinite line charge with Charge-per-unit-lenght λ is

E=λ/2∏εx

At distant x from the line, find the field due to an infinite "Ribbon" of charge 2cm wide, at point 2 cm from one edge in the plane of the Ribbon. The surface charge density on the Ribbon is σ=2x10^-6C/m².
Note: Linear charge density on width dx of the ribbon is σdx

Homework Equations

E=σ/2ε

The Attempt at a Solution

I am lost and I am not sure how to start the problem

 

[TSny]

Break the ribbon into strips of infinitesimal thickness dx.