1. The problem statement, all variables and given/known data See figure attached for problem statement, solution provided and my solution. 2. Relevant equations 3. The attempt at a solution I'm getting confused about the reference point for the potential. First find the potential at point z with reference at infinity, [tex]\phi(z) - \phi(\infty) = \alpha[/tex] Now find the voltage at point z=0 with reference at infinity, [tex]\phi(0) - \phi(\infty) = \beta[/tex] Now the potential at z with the reference at z=0, which is the same as the voltage difference between the individual voltages at z and z=0 with their reference point at infinity. (Is this statement true?) [tex]\alpha - \beta = \phi(z) - \phi(0)[/tex] The question wants me to solve for, [tex]\phi(z)[/tex] but it seems as though I've given them, [tex]\phi(z) - \phi(0)[/tex] What am I interpreting differently? What am I confusing myself with? Thanks again!