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Nov 15, 2011 at 11:36 comment added Georg @pcr, I erased my comment when I realized that Chris knows better than any answer, especially when he wrote ""especially when these are rings moving in weird ways (or just rings moving towards the other sphere?) and not planes moving closer to each other..."". He lacks imagination of the one-dimensional nature of the problem.
Nov 15, 2011 at 5:45 history edited pcr CC BY-SA 3.0
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Nov 15, 2011 at 2:40 history edited pcr CC BY-SA 3.0
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Nov 15, 2011 at 2:26 history edited pcr CC BY-SA 3.0
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Nov 14, 2011 at 21:40 comment added Chris Gerig See my comment above, I do not see how Earnshaw is sufficiently applied, because there are not only electrostatic forces here... And the field lines argument is not rigorous so it could be incorrect. But in addition, I would like to see your energy change calculation as well.
Nov 14, 2011 at 21:29 history answered pcr CC BY-SA 3.0