1. The problem statement, all variables and given/known data Expanded from Griffith's (3rd ed) #2.47 Infinitely long wires parallel to x axis carrying ±λ charge densities intersect the y-axis at ±a. A) Calculate V(x,y,z) if V(0,0,0)=0 B)Show that the equipotential surfaces are circular cylinders. Locate the axis and calculate the radius of the cylinder that is at potential V0. 2. Relevant equations Gauss, -∫Edl E=-∇V ?x2+y2=r2? 3. The attempt at a solution I've found the solution to part A easily enough but I'm not sure how to approach B. I know that at the origin the potential is zero along the x axis but I'm confused by how I should show that these are both circular cylinders. I'd post my solution for A but it's exactly the same as the solution manual so it's easy enough to find. Any help would be appreciated.