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\begin{figure}\centerline{ \psfig{file=problems/prob_3_5.eps,height=2.5in} }\end{figure}

Find the electric potential on the ($z$) axis of a disk of charge of radius $R$ with uniform surface charge distribution $\sigma$.

For extra credit (if you have time) find the electric field on the $z$-axis.

Robert G. Brown 2003-02-09