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 Feb 1 awarded Popular Question Nov 25 awarded Popular Question Oct 2 comment Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) @DavidZ Thanks David, I appreciate the suggestion and have taken your advice. Oct 2 revised Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) Explanation as to why this question is not a duplicate, plus more information corroborating Alfred Centauri's answer. Oct 2 comment Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) I see I'm in the minority on this one. I still retain my original viewpoint that the answer posed by Alfred Centauri below which points out my mistake and the inherent paradox in the question are not addressed in the other post mentioned, and so this post should not be closed as a duplicate. It looks, however, as if many other people disagree. Oct 2 accepted Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) Oct 2 comment Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) Wow, thanks. I found this confusing. It seemed much more natural to assume that the work done would be a result of the total electric field at the location of the moving plate. It seems that by Newton's third law, an object cannot exert a net force on itself (meaning that the moving plate cannot do work on itself). Oct 2 comment Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) @CarlWitthoft I'm not sure I understand what you're saying. I read the other post, and they do not mention energy. However, the above question concerns energy. Oct 2 comment Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) @CarlWitthoft That post does not address the concept of energy. Oct 2 awarded Citizen Patrol Oct 2 asked Energy Stored In A Capacitor (Slowly Moving Parallel Plates Together) Oct 6 awarded Editor Oct 6 revised Electron Incident On A Finite Potential Barrier removed the phrase "minus infinity" Oct 6 comment Electron Incident On A Finite Potential Barrier Thanks, that's a good idea. After substituting in, I'm getting $k_{left}=6.2746\times10^{-9}\;m^{-1},$ $k_{right}=3.62264\times10^{-9}\;m^{-1},$ and $|D|^2+|G|^2=1.67949|C|^2,$ so I must have made a mistake somewhere... Oct 6 asked Electron Incident On A Finite Potential Barrier Sep 23 accepted Length Contraction And Simultaneity Sep 23 asked Length Contraction And Simultaneity Sep 8 awarded Scholar Sep 8 awarded Supporter Sep 8 accepted Rotating/Translating Disk