1. The problem statement, all variables and given/known data How do I calculate Volts per cm (V/cm) with the following given? Two coaxial tubes with 20kV placed across them. Inner tube (actutally solid rod) has an OD of .5" and a length of 4" Outer tube has an OD of 1.00" and a length of 4" 2. Relevant equations 3. The attempt at a solution I was going to calculate the Area of the inner and outer tubes and convert them to cm, then divide the total area by the applied voltage? Somehow I don't think that is right???