Calculating Potential from Infinite Line Charge Hi there, this is my first post and I hope you don't mind helping me out a bit because I'm really stuck. I'm doing computer science in university and the electrotechnology part can be a bit tricky for us. I have a basic understanding of physics, Coloumb's Law, Voltage etc... but I don't know about this infinite line charge stuff. I'm not looking for a solution, I actually have the answer here (it's 6.24v in case you're interested) but I'd like to know how to calculate it. If this wasn't a line charge, i.e. if this was a point charge at the origin, I would be able to do it. Thanks in advance Edit: I noticed in the FAQ it said I should show my attempts. The thing is, I know how to finish it, just not how to begin it. So if I were to go about this, I would get the potential of each point using this formula: q/(4)(pi)(eps)(r). I derived that from integrating Coloumb's Law with respect to r. I'd then subtract point b from point a to get the voltage. Coloumb's law wouldn't appear to work here though because it's a line charge and not a point charge. This is my attempt, I hope it's not too pathetic.