How to calculate attractive force between mag & electromag?

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To calculate the attractive force between a permanent magnet and an electromagnet, a functional equation based on distance is needed. The complexity of magnetic fields makes it challenging, but resources like Wikipedia provide foundational formulas. Searching for "how to calculate the force between magnets" can yield useful results. Modeling one magnet type as the other can simplify the calculations. Understanding these principles is essential for accurate force estimation.
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I am aware of the complexity of magnetic fields, all i need is a ballpark functional equation of distance between an electromagnet and a permanent magnet. Can anyone point me in the right direction?
 
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