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Solution: Equations for the velocity field for the 2D source.


\begin{figure} \centering\epsfig{file=lfig109.eps,height=2in,clip=}\end{figure}


\begin{displaymath}\nabla \phi = \frac{\partial \phi }{\partial r}\hat {e}_r = \... ... {e}_r , \mbox{\ i.e. \ } v_r = \frac{m}{2\pi r}, v_\theta = 0 \end{displaymath}