Talk:Poisson equation

I have a Poisson Equation (in a permanent magnet machine) like below:

$\frac{\partial^2 A(r,z)}{\partial z^2}+\frac{\partial}{\partial r} ( \frac{1}{r} \frac{\partial}{\partial r} r A(r,z))=B(r,z)$

Would anybody help me to solve?