Force between 2 electromagnets

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SUMMARY

The calculation of the force between two electromagnets can be approached using the Biot-Savart law for closer distances or approximated as dipoles when they are far apart relative to their size. In this discussion, the user has specified two iron cores measuring 10mm in diameter and 20mm in length, with coils consisting of 500 turns of 0.3mm wire thickness, and a current of 0.2 Amperes. The distance between the electromagnets varies from 2mm to 15mm, which influences the choice of formula for calculating the attraction and repulsion forces.

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  • Understanding of Biot-Savart law
  • Knowledge of magnetic dipole approximation
  • Familiarity with electromagnet design and specifications
  • Basic principles of electromagnetism
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Engineers, physicists, and hobbyists interested in electromagnet design and analysis, particularly those calculating forces between electromagnets in various configurations.

Shahryar
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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.
 
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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.
 
mfb said:
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.

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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