it is said that the levi-cevita symbol is coordinate independent, however, the way you wrote the del operator represents del in cartesian-like coordinates.

The final result is, of course, correct, but I can’t see why we don’t need to change our levi-cevita symbol (when using polar, spherical coordinates, for example)

Thanks!

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]]>I am guessing that the mistake is due to singularities in crossing over the boundary of the interior surface of the conductor

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