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Electromagnetic equation help please

  1. Sep 29, 2013 #1
    Hello all,
    I am not at all good at physics or have studied it but have been asked to build something rather peculiar.

    I need to have an electromagnet which will have enough strength when activated to bring a 10 kg steel weight from above it down to meet the magnet. It would be positioned 150cm meter below the 10kg weight which is on a pivot with an armature length of 100 cm.

    How can I figure out what size magnet and how many coils of copper I would need around what diameter and how many volts I need?

    If any one could help it would be greatly appreciated.

    Thanks
     
  2. jcsd
  3. Sep 29, 2013 #2
    This is very tricky. You can calculate the magnetic field and the force required fairly easily, but to calculate the relationship between them is complicated, and will depend a lot on the geometry and the magnetic characteristics of the steel, and probably the core as well.

    I'd recommend trial and error or a numerical approach.
     
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