Repulsive force by itself on a charged sphere

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SUMMARY

The discussion centers on the challenges of containing a significant charge within a spherical conductor, specifically addressing the repulsive forces that arise from the charge itself. It highlights that any excess charge on a conducting sphere will distribute itself across the surface, leading to instability in other configurations. The mechanical stresses on a charged spherical shell, particularly the Poincare stress, are crucial for understanding the forces at play. Historical investigations around 1900 provide foundational insights into these electromagnetic properties.

PREREQUISITES
  • Understanding of electrostatics and charge distribution
  • Familiarity with conducting spheres and their properties
  • Basic knowledge of mechanical stress and pressure concepts
  • Introductory calculus for analyzing infinitesimal charge distributions
NEXT STEPS
  • Research the Poincare stress and its implications in electromagnetism
  • Study the properties of charged spherical shells in electrostatics
  • Explore historical studies on electromagnetic mass and its relevance
  • Learn about the mathematical modeling of charge distributions using calculus
USEFUL FOR

Physicists, electrical engineers, and students interested in electrostatics and the mechanical properties of charged systems will benefit from this discussion.

Zeor137
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I was wondering how could I hold a lot of charge inside, for example, a ball. I thought by wrapping it in an isolant and using a hole with a semiconductor to charge it without letting anything out. But them it also could blow apart by the repulsive force of itself. Therefore, I got curious of how to calculate the pressure necessary to hold it still. I thought about considering it a bunch of infinitesimal balls with infinitesimal charge but I don't now enough calculus yet to put it in a equation.
 
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For any conducting sphere all of the extra charge will move to the surface; any other configuration is unstable.

The math is given here: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elesph.html#c2

Your question then becomes: what are the mechanical stresses on the charged spherical shell with surface charge? This was investigated extensively around 1900 while trying to understand the properties of the newly discovered electron. For example, Poincare stress:
http://en.wikipedia.org/wiki/Electromagnetic_mass#4.2F3_problem
 

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