Magnetic Enrgy (B^2/2u or H^2/8pi)

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Discussion Overview

The discussion revolves around the expressions for magnetic energy, specifically comparing the formulations B^2/(2μ) and H^2/8π. Participants explore the implications of different unit systems and the relationship between the magnetic field quantities B and H.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • Some participants note that B and H are distinct quantities, which is fundamental to understanding the different energy expressions.
  • One participant questions the reason for the different formulations of magnetic energy in various references, seeking clarification on the unit systems involved.
  • Another participant explains that the π factor is associated with the CGS system using non-rationalized units.
  • There is an acknowledgment that the initial inquiry was not fully addressed in the first response, indicating a need for more precise information.

Areas of Agreement / Disagreement

Participants generally agree on the distinction between B and H, but there remains some uncertainty regarding the implications of different unit systems and the exact nature of the energy expressions.

Contextual Notes

Limitations include the need for clarity on unit conversions and the specific contexts in which each energy expression is used, which are not fully resolved in the discussion.

asheg
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Hi,

I have a problem that in some references the magnetic energy is B^2/(2 mu) and in some references it is H^2/8pi. is it a matter of units and if it's so what is the name of these unit system (i.e. MKS). How I can convert them.
 
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dextercioby said:
First of all B and H are not the same thing. Next comes the problem with units. Please, read here http://en.wikipedia.org/wiki/Magnetic_field

Thank you for your reply,
But it doesn't answer my question perfectly. I know the difference between H and B. I want to know why in a system we have (Energy = mu H^2/2) and in other (Energy = H^2/8 pi)
 
Thank you, It answers my question perfectly this time
 

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