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Magnetic pull force with a gap

  1. Apr 26, 2012 #1
    Hello. I'm a cabinetmaker and my college physics courses are 25 years behind me now. I'd consider it a kindness if someone would answer a question for me regarding magnetism.

    I have a magnetic strip that is described as having 6.2 lb. of magnetic pull force per lineal foot, 1" wide and 0.020" thick, and at 0" of air gap.

    How would I recalculate that for a gap of about 1/8" through a transparent material such as lexan?

    I'm hoping it's as simple as applying some co-efficient or simple calculation based on the gap distance.

    Thank you.
  2. jcsd
  3. Apr 26, 2012 #2
    there isn't a simple way to do it, you'll just need to measure the force for a single foot of the material with the spacing. Even then it will only be an approximation. the force for a single foot will be the force per foot you're looking for.
  4. Apr 26, 2012 #3


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    Staff: Mentor

    I think I would try to determine it in experiment. While it is possible to calculate it with some additional assumptions about the magnetism in the strip, I think that the corresponding errors would be quite large.

    Edit: Nice timing.
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