Consider two very large plates, one of which is lying on the $xz$ plane and sitting at a potential $+V$, and the other forming an angle $α$ with the aforementioned plate, attached to the other at the $z$ axis, only this one is sitting at a potential of $-V$.
My aim is to find the potential at every point in space for 3 cases, where the angle $\alpha$ is $\pi$, $\pi/2$, $\pi/4$. I started from the first case. The problem has cylindrical symmetry, so my idea was to use cylindrical coordinates. The general solution to the laplace equation in cylindrical coordinates with cylindrical symmetry is well known of course:
However, I have major trouble with the conditions. Consider the case where $\alpha = \pi$. My first instinct would be ditching the terms with $\ln(s)$ and $1/s$ so as not to have trouble at the origin. That's all well and good, but then when I try to satisfy the condition that $V(s, 0) = V$, I'm forced to ditch all the Am's too, but then there is no way to make it so that $V(s, \pi) = -V$. Any ideas?