Force between 2 electromagnets

AI Thread Summary
To calculate the force between two electromagnets, the Biot-Savart law is applicable when they are close together, while they can be approximated as dipoles if they are far apart. The user has two iron cores measuring 10mm in diameter and 20mm in length, with coils of 500 turns using 0.3mm wire, capable of carrying 0.2 Amperes. The distance between the electromagnets ranges from 2mm to 15mm. Basic formulas for these calculations can be found on Wikipedia. Understanding the complexities of these forces is essential for accurate computation.
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
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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