Distance and material affects on magnetic full strength

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Discussion Overview

The discussion revolves around the impact of distance and material, specifically 1/4 inch plywood, on the pull strength of a magnet when placed between the magnet and a metal surface. Participants explore theoretical and practical implications of this setup.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about the effect of 1/4 inch plywood on a magnet's pull strength when placed between the magnet and a metal surface.
  • Another participant suggests that the effect of plywood will be similar to that of air, referencing permeability in electromagnetism.
  • It is proposed that magnetic force is inversely proportional to distance, implying that plywood, being non-ferromagnetic, may not significantly affect the pull strength.
  • A different viewpoint emphasizes the importance of the distance between the magnet and the metal surface, noting that attraction force is much stronger when the magnet is in close contact with the object.
  • A participant expresses intent to calculate the necessary pull strength of a magnet to accommodate the 1/4 inch gap, indicating further research will be conducted.

Areas of Agreement / Disagreement

Participants present multiple perspectives on the influence of plywood on magnetic pull strength, with no consensus reached regarding the significance of the material's presence or the effect of distance.

Contextual Notes

Participants reference the permeability of materials and the relationship between distance and magnetic force, but the discussion does not resolve the assumptions or calculations necessary for determining pull strength.

TonyL
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Hi Folks:

This is my first post, I hope that I observing the proper etiquette. If I have a magnet with a known pull strength is there a way for me to determine the affect of 1/4 inch plywood on the magnets pull strength when the plywood is placed between the magnet and the surface metal?

Thank you for reading!
 
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TonyL said:
Hi Folks:

This is my first post, I hope that I observing the proper etiquette. If I have a magnet with a known pull strength is there a way for me to determine the affect of 1/4 inch plywood on the magnets pull strength when the plywood is placed between the magnet and the surface metal?

Thank you for reading!
It will be almost the same as 1/4 inch of air. See the table here
https://en.m.wikipedia.org/wiki/Permeability_(electromagnetism)
 
Magnetic force on the metal surface is inversely proportional to the distance. I feel the plywood, a non ferromagnetic material, should not have any
significance to the outcome.
 
Possibly more important is the effect of the 1/4 " stand off . A magnet produces much higher attraction force when attracted object is very near or in direct contact than it does when there is a significant gap .
 
Thank you all very much. I see from the wiki article and your response that air and wood have a similar affect. I need to calculate the pull strength so that I can buy the correct magnet (pull strength) to allow for the 1/4 inch gap. I will conduct more research. Thanks again!
 

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