3. Ribbon of charge An innitely long ribbon of width w lies in the my plane with its edges at a: = w/ 2 and x = w / 2. The ribbon carries a uniform charge per unit area 0'. (a) Find the electric eld at the point (0, y, 2). Note that this problem involves a nontrivial integral. Feel free to use a tool such as Wolfram Alpha to evaluate it, but cite whatever tool you use. (b) Find an approximate expression for the eld at (0, y, 2) when |z| > w. (d) Rewrite your approximate expression for the eld at (0, y, 2) when |z| >> it: in terms of A, the charge per unit length of the ribbon, instead of in terms of o