Modification in Coulomb's Law and its implications

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Homework Help Overview

The discussion revolves around a hypothetical modification of Coulomb's Law, specifically considering an inverse cube relationship instead of the traditional inverse square relationship. Participants explore the implications of this change on an isolated charged conducting sphere, particularly focusing on the electric field within the sphere and the volumetric charge density.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants question how an inverse cube relationship would affect the electric field inside a charged conducting sphere and the nature of the volumetric charge density. There are inquiries about the intuitive understanding of charge behavior within the conductor.

Discussion Status

The discussion is ongoing, with some participants seeking clarification on the implications of the modified law and others emphasizing the need for mathematical backing rather than relying solely on intuition. There is recognition of the counterintuitive nature of charge density being non-zero within the conductor.

Contextual Notes

Participants reference an examination context where this concept was discussed, highlighting the contrast between intuitive expectations and the claims made regarding electric fields and charge density in the bulk of the conductor.

Aastik Tripathi
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If the coulomb's law instead of following an inverse square relationship, follows an inverse cube relationship, How would it affect an isolated charged conducting sphere? How would it's field vary within the volume and how would the volumetric charge density be affected?
Please give in some valuable insights , would be helpful .
 
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Aastik Tripathi said:
If the coulomb's law instead of following an inverse square relationship, follows an inverse cube relationship

It doesn't. Is there a particular reason why you are asking?
 
PeterDonis said:
It doesn't. Is there a particular reason why you are asking?
It came up when I was attending my classes , that in some examination this concept was asked using a charged spherical conductor as mentioned above, the answer was told that it there will not be any electric field inside the bulk of the conductor which was quite intuitive, however the charge density was claimed to be non zero, which was quite counter intuitive as I believed charges would experience repulsion when present in the bulk, that's why I posted this to clear the doubt .
 
Aastik Tripathi said:
in some examination this concept was asked using a charged spherical conductor as mentioned above, the answer was told that it there will not be any electric field inside the bulk of the conductor which was quite intuitive, however the charge density was claimed to be non zero, which was quite counter intuitive as I believed charges would experience repulsion when present in the bulk

Can you post any math that was used? Normally here at PF we only discuss the actual theories of physics, not alternative theories; but I can see the point of an exam question like this if it is to show you why an inverse square law matches our actual experience where an inverse cube law would not. But the answer should be based on math, not intuition.
 
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