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Force between 2 electromagnets

  1. Jun 7, 2015 #1
    I am looking forward to know how to calculate the force between 2 electromagnets. what is the formula to find attraction and repulsion forces between them ?

    Thank you.
  2. jcsd
  3. Jun 7, 2015 #2


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    2017 Award

    Staff: Mentor

    In general, those forces are complicated. If the electromagnets are far away from each other (relative to their size), you can approximate them as dipoles. Otherwise, the Biot-Savart law can be used.
    See Wikipedia for basic formulas.
  4. Aug 10, 2015 #3
    I have 2 iron cores with 10mm dia x 20mm length. with a coil with 500 turns of 0.3mm wire thickness, i guess i can pass 0.2 Ampere through that wire. The maximum distance between these 2 electromagnets is 15mm and minimum is 2mm
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