A simple question regarding spheres and spherical shells

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SUMMARY

The discussion centers on the equation for surface charge density, represented as σ = ρ dr', where σ denotes the surface charge density, ρ represents volume charge density, and dr' signifies an infinitesimal thickness. This relationship is crucial for understanding the distribution of charge in spherical shells. The equation illustrates how charge density varies with respect to the thickness of the shell, providing a foundational concept in electrostatics.

PREREQUISITES
  • Understanding of electrostatics principles
  • Familiarity with charge density concepts
  • Basic knowledge of calculus, particularly integration
  • Concept of spherical coordinates
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  • Research the derivation of charge density equations in electrostatics
  • Study the applications of spherical shells in electric fields
  • Learn about Gauss's Law and its relation to charge distributions
  • Explore the implications of charge density in different geometries
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Students of physics, particularly those studying electrostatics, educators teaching introductory physics, and anyone interested in the mathematical modeling of charge distributions.

LostInToronto
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Moved my question to Intro Physics. Mods feel free to delete.
 
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I found the answer online. Apparently

\sigma=\rho dr'.

This doesn't really make sense to me. Can anyone clear up why this is so?
 

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