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Magnetic force lost when you break a magnet?

  1. Oct 24, 2012 #1
    if you have a magnet that pulls 40lbs of force if you broke that into 2 how much force will each magnet pull.

    i have some neodymium magnets from hardrives and i wanna break them up but i wanna know if thats gunna make them lose alot of force. anyone know the formula for calculating such a thing? or better yet just plane old english will work lol. thanks
  2. jcsd
  3. Oct 24, 2012 #2
    if you break it in two equal parts they will pull 20 lbs every one
  4. Oct 25, 2012 #3

    Meir Achuz

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    It depends how you break them. If you bereak them like this |S_________|__________N|,
    you will get two magnets with the same 40 pounds. Breaking then along the length, would give two magnets of 20 pounds. For a given magnetization, the force is proportional to the area of the (N or S ) end of the magnet.
  5. Oct 25, 2012 #4
    I'm not at all sure that breaking a modern magnet in half will give you something like 50:50.

    I would guess that's true of an old steel magnet but modern crystalline high-power magnets are much more sophisticated and might react badly to being fractured.

    Anyway, it would be interesting to find out.
  6. Oct 25, 2012 #5
    Maybe you will gain some force, since 2 magnets can be placed closer to the surface than 1 big magnet. Why don't you try it out and tell us the result?
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