Could someone PLEASE help me with these physics questions? please show work, I WILL RATE GOOD

(5) For a moment consider a finite line charge. Why would it be impossible to use Gauss' law to determine the electric field for a finite line charge? (Hint: consider what the electric field does near the ends of the charge distribution.) (6) In the previous question you should have concluded that the correct Gaussian surface to use is a cylinder with the line charge running along the axis of the cylinder. Now use Gauss' law to determine the electric field from a line charge, with charge/unit length A. Explain why the flux through the end-caps is zero, and argue that: JE.dA = [ EdA = ES dA = EA, where A = 2wrL is the area of a cylindrical surface of radius r and height L. Next determine Qenci in terms of A and L: Finally put it all together and find E(r)