Originally Posted by

**Hornblower**
Let me remind everyone that the Shell Theorem is exact only in a thought exercise in which the charge is continuous in distribution. If we have a real world shell on which the charged entities were discrete particles and their separation was large compared to the separation of an interior particle and a shell particle, then there will be departures up close to the shell. These departures become virtually zero as we move away inside.

Lets say we have a positive charge, surrounded by 12 negative charge in a cuboctahedron structure. They are very close. Because of the shell theorem, there is no field. But because they are very close, there will be some departures close to the shell. How close to the shell do these departures take place. Do we know the mechanisms, what the field lines look like, the exact distances to these departures, or do we just know there are departures. Are the distances on the order of nanometers, femtometers or what? Thanks for any insights.

The moment an instant lasted forever, we were destined for the leading edge of eternity.