Resources on non-spherical conductor surface charges

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Discussion Overview

The discussion revolves around the mathematical treatment of charge distribution on non-spherical conducting surfaces, particularly focusing on the concentration of charges at sharp edges. Participants seek resources and methods to understand this phenomenon more rigorously, including analytical and numerical approaches to solving Poisson's equation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants note that charges tend to concentrate on sharp edges of conducting surfaces and seek rigorous mathematical resources to understand this behavior.
  • One participant emphasizes that there is no simple plug-and-chug equation for this phenomenon, describing it as a complex boundary-value problem that typically requires numerical solutions.
  • A participant inquires about the existence of analytical methods to solve or approximate solutions to Poisson's equation in these scenarios, specifically regarding the mathematical demonstration of charge concentration at pointed surfaces.
  • Another participant references a textbook proof involving two conducting spheres connected by a wire, discussing the distribution of total charge and suggesting a resource for further reading.

Areas of Agreement / Disagreement

Participants generally agree on the complexity of the problem and the need for rigorous mathematical treatment, but there is no consensus on the availability of analytical solutions or specific methods to demonstrate charge concentration at sharp edges.

Contextual Notes

The discussion highlights the limitations of existing resources and the challenges in finding analytical solutions for non-spherical conductors, as well as the dependence on specific configurations and boundary conditions.

albertrichardf
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Hi all,
I know qualitatively that charges tend to concentrate on sharp edges of conducting surfaces. I have tried searching online for a mathematical treatment of such a phenomenon, but I cannot find anything that's quite rigorous. I'd appreciate it if someone could guide me towards such resources.
Thank you.
 
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Albertrichardf said:
Hi all,
I know qualitatively that charges tend to concentrate on sharp edges of conducting surfaces. I have tried searching online for a mathematical treatment of such a phenomenon, but I cannot find anything that's quite rigorous. I'd appreciate it if someone could guide me towards such resources.
Thank you.

Define "mathematical treatment".

If you want a plug-and-chug equation, there is no such thing. This is really a complex boundary-value problem involving finding the solution to Poisson's equation. Only the simplest and highly-symmetric cases will you find an analytical solution. Otherwise, you have to solve it numerically, typically using finite-element analysis.

Zz.
 
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Thanks for answering. I mean, are there any analytical methods to solve, or approximate a solution to Poisson's equation in these cases? Or at least show mathematically, that the charges tend to concentrate at the tip of a pointed surface?
 
The textbook proof goes this way.
Consider two conducting spheres, with radii ##R_1## and ##R_2##, separated by a large distance ##r \gg R_1,R_2## but connected by a wire. The surfaces have the same electric potential.
If the total charge is ##Q_1+Q_2##, what are ##Q_1## and ##Q_2## (how must that total charge be distributed)?
See, e.g., https://www.feynmanlectures.caltech.edu/II_06.html#Ch6-S11
 

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