Solenoid force calculation

  1. Hi all, i'm trying to calculate solenoid force using this tool:

    http://www.daycounter.com/Calculators/Magnets/Solenoid-Force-Calculator.phtml

    I can't understand the ralation with A in the formula and also if this formula takes into account the lenght of solenoid.

    I explain better:

    If i have a solenoid with 2000 turns inner diameter of 10mm wire diameter of 0.1mm and solenoid lenght of 20mm i have 17.66 mH inductance.
    If i have a solenoid with 2000 turns inner diameter of 10mm wire diameter of 0.1mm and solenoid lenght of 10mm i have 31 mH inductance.

    I have more layers of wire in 10mm instead in 20mm and the force is higher.

    So, this calculator calculate on a single layer? so does not consider the length of solenoid?

    I need to calculate on a multiple layer solenoid. There is formula that from Magnetic B-field or Inductance i obtain force on a pice of metal that distant g(stroke)?
     
  2. jcsd
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