Coulomb's epsilon zero and its name

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    Epsilon Zero
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Discussion Overview

The discussion revolves around the term "epsilon zero" in Coulomb's law, specifically its designation as the permittivity constant and the implications of this naming convention. Participants explore the conceptual understanding of epsilon zero in relation to electric force and its interpretation in different contexts, such as physics and engineering.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that as epsilon zero increases, it should imply a greater force between charges, questioning the justification of the term "permittivity" based on its etymology.
  • Another participant states that epsilon zero represents the ratio of charge enclosed by a surface to the electric flux, deeming the term "permittivity of vacuum" as archaic and unnecessary.
  • A different viewpoint is presented using an analogy of smoke in space, arguing that the medium allows the force to propagate, thus supporting the idea of "permitting" the interaction.
  • One participant notes that a large value of epsilon allows for significant charge buildup with minimal voltage, suggesting that the term may be more relevant in engineering contexts, particularly regarding capacitors.
  • A later reply expresses satisfaction with the engineering perspective on capacitors, indicating an understanding of the discussion's context.

Areas of Agreement / Disagreement

Participants express differing views on the appropriateness of the term "permittivity" and its implications, indicating that multiple competing interpretations remain without a consensus.

Contextual Notes

The discussion highlights the ambiguity in the term "permittivity" and its implications in different fields, as well as the lack of clarity regarding the relationship between epsilon zero and electric force.

DaTario
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In Coulomb's law the term epsilon zero appears in the denominator and receives the name of permittivity constant [\b]. As it comes from the word permit (allow) then it would seem reasonable, for me at least, to expect that, as epsilon zero increases, the vacuum would be allowing one charge to better "see" the other, and then the force would be greater. But it is the opposite.

Is this name justifiable in some acceptation of this word ?
 
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Epsilon zero is the ratio between the charge enclosed by a surface and the electric flux through that surface. The name "permitivity of vacuum" is archaic and pointless.
 
But consider a space full of smoke. If the force had to do with seeing the other, this part played by the space has some sense in permiting the force to cross the space in between.

I would like seeing epsilon zero in the numerator so as to call it permitivity.
 
A large value of epsilon "permits" lots of charge
to build up, with fairly small Voltage.

It's archaic, and inverse to the physicists' viepoint
which usually emphasizes the fields,
but is reasonable for engineering purposes (as in capacitors).
 
I am satisfied with this answer. The capacitor view point is quite understandable.

Best Regards,

DaTario
 

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