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$\begin{figure}\centerline{ \psfig{file=problems/problem_00007.eps,height=2.5in} }\end{figure}$

A flat disk of radius and mass with uniform surface charge density $\sigma_q = \frac{Q}{\pi R^2}$ is rotating at angular velocity $\omega$ about the -axis as shown.

Find its magnetic field at an arbitrary point on the -axis.

Robert G. Brown 2003-02-09