# Homework Help: Laplace equation involving a disk

1. Jul 23, 2011

### dp182

1. The problem statement, all variables and given/known data
disk has a radius C with boundary conditions
V(C,$\vartheta$)={cos($\vartheta$) ;-$\pi$/2$\leq$$\vartheta$$\leq$$\pi$/2. 0; otherwise
solve the laplace equation

2. Relevant equations
co/2+do/2ln(r)+$\sum$(cn1rn+dn1r-ncos(n$\vartheta$)+(cn2rn+dn2r-nsin(n$\vartheta$)

3. The attempt at a solution
my main problem is where do I input my boundaries if im not given an initial V(0,$\vartheta$) do I just assume To and solve or do I use somethings else