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Meir Achuz

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The steps for one ring are:

1. Find phi on ths axis.

2. Expand phi in a Taylor series for either z>a or z<a.

3. Use this expansion to write the Legendre polynomial expansion for all

angle. Use phi=\sum r^L P_L(cos\theta) (or 1/r^{L+1}).

4. Take grad phi to get E.

The result is a bit messy for two rings, but it can be done.

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