Two Conducting Spheres Connected

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Discussion Overview

The discussion revolves around the behavior of charge distribution on two conducting spheres connected by an ideal wire, particularly focusing on the implications of differing radii on charge density and potential. Participants explore the conceptual understanding of electric potential and charge distribution in a theoretical context.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes that when a charge is applied to one conducting sphere and connected to another, the potential at the surface of each sphere must be the same, despite differing radii leading to unequal charge densities.
  • Another participant suggests that if the surface charge density were the same on both spheres, the charges would be more crowded on the smaller sphere due to its curvature.
  • A later reply reiterates that the surface charge density is indeed greater on the smaller sphere, indicating a nuanced understanding of how charge distributes itself based on geometry.
  • One participant expresses a desire for a more intuitive explanation beyond mathematical proofs, indicating a struggle with the counterintuitive nature of the concept.

Areas of Agreement / Disagreement

Participants generally agree on the relationship between potential and charge distribution but express differing views on the implications of charge density related to sphere size. The discussion remains unresolved regarding the most intuitive understanding of these concepts.

Contextual Notes

Participants acknowledge the complexity of the topic, including the dependence on geometric considerations and the implications of surface charge density, which may not be immediately intuitive.

LikwidN2
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When a charge is applied to a conducting sphere and connected to another conducting sphere by an ideal thin wire (infinite distance apart), the potential at the surface of each sphere is the same.

However, that means (for spheres of different radii) that the charge density on each sphere would be unequal. This seems counterintuitive. Why wouldn't the charges maintain maximum (and therefor equal) distances from each other, giving equal charge density.

It's been proved to me using Gauss's Law, and the numbers work right, but to me that's the equivalent of saying the sky is blue because a camera detects it as being blue (apologies for the awful analogy, but I think you'll get what I mean - I want something more concrete and intuitive).

Is there any such explanation? I'm not doubting Gauss or my physics textbook, just trying to understand this seemingly fundamental concept.

Thanks in advance,
Likwid

P.S - Lucky you guys, there's actually no problem attatched to this question.
 
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Naively, if the surface charge density on each sphere was the same, then the charges would be much more crowded on the smaller sphere (since it curves more into 3D).
 
cesiumfrog said:
Naively, if the surface charge density on each sphere was the same, then the charges would be much more crowded on the smaller sphere (since it curves more into 3D).

The surface charge density is actually more on the smaller sphere...
 
Thanks for both the replies all the replies. I think I finally get it.
 
Shooting star said:
The surface charge density is actually more on the smaller sphere...

ah. More crowded in 3D, but importantly less crowded tangentially. :smile: This naivity thing isn't working out so good anymore..
 

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