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I Distance and material affects on magnetic full strength

  1. Jun 10, 2016 #1
    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!
  2. jcsd
  3. Jun 10, 2016 #2


    Staff: Mentor

    It will be almost the same as 1/4 inch of air. See the table here
  4. Jun 10, 2016 #3
    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.
  5. Jun 10, 2016 #4


    User Avatar
    Science Advisor
    Gold Member

    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 .
  6. Jun 10, 2016 #5
    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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