p-2 please help me with the below problem with step by step explanation clearly.

Needed only question 2 but for reference problem-1 is attached.

Question - 1

Find the electric field due to an infinitely long cylinder of radius R and uniform charge/volume p, for a) r R.Using your answer from Problem 1), find the electric potential difference AV between radius r = R/2 and r = 2R. You can still get credit even if your answer from Problem 1) is incorrect, if your approach to this problem is correct. Don't be scared by (simple) integrals or a little algebra. Don't worry about minus signs, but at which radius r is the potential higher? Briefly explain. Think carefully