Area perpendicular to a magnetic field from Faradays Law

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Discussion Overview

The discussion revolves around the concept of "Area perpendicular to the magnetic field" in the context of Faraday's Law, particularly as it relates to permanent magnets and axial flux generators. Participants explore how this area is defined and its implications for voltage calculation in electromagnetic systems.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question whether the "Area perpendicular to the magnetic field" produced by a permanent magnet is equivalent to the area of the magnet itself.
  • Others suggest that the area can vary depending on the specific context of the problem being addressed.
  • One participant proposes that in the case of an axial flux generator, the relevant area may be that of the permanent magnet rather than the area occupied by the wire in the stator.
  • A later reply emphasizes that the voltage is determined by the rate of change of magnetic flux, regardless of the area, and mentions the importance of adapting calculations to specific geometries and units.

Areas of Agreement / Disagreement

Participants express differing views on the definition and relevance of the "Area perpendicular to the magnetic field," indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Some limitations include potential misunderstandings of magnetic units and the dependence on specific geometrical configurations, which are not fully clarified in the discussion.

jearls74
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Hello Everyone,

I have a question concerning the "Area perpendicular to the magnetic field".

If the field was produced by a permanent magnet, would the "Area perpendicular to

the magnetic field" be the same size as the Area of the permanent magnet?
 
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jearls74 said:
Hello Everyone,

I have a question concerning the "Area perpendicular to the magnetic field".

If the field was produced by a permanent magnet, would the "Area perpendicular to

the magnetic field" be the same size as the Area of the permanent magnet?

The area can be anything you want. It just depends on what you are trying to find. Can you provide more context to your question?
 
When calculating voltage for an axial flux generator with a permanent magnet rotor,

would the "Area perpendicular to the magnetic field" be the Area that the wire in the stator

occupies, or would the "Area perpendicular to the magnetic field" be the same size as the

Area of the permanent magnet? I believe the " Area perpendicular to the magnetic field" is

is Area of the permanent magnet that the field is coming from and not the Area of the stator

that the wire occupies but i need someone that knows more about Faradays Law to tell me

if I am right or not?
 
Check out this Faraday's Law explanation.

farlaw.gif
 
Nice job Don ! Great link, and scholarly...

The voltage is determined by the magnetic flux enclosed by your turns... Well,,, Actually by rate of change of that flux...
Probably there's several different ways to calculate that.

@ original poster:
Brush up on your magnetic units.
One weber per second will cause one volt in one turn whatever its area. You'll have to adapt that to whatever geometry and units you are given.


old jim
 

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