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For questions that utilize the concept of magnetic fields (commonly denoted by the letter B), or for questions whose answers likely involve magnetic fields. More specific than the [magnetism] tag, as questions about the phenomenon & theory of magnetism do not necessarily involve the discussion of fields.

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What is the formula for the pull force of a cylindrical magnet

I have an axially magnetized neodymium magnet of diameter $d$ and height $h$. The material is N42. I would like to derive a formula for the pull force. This calculator does it: https://www.kjmagnetic …
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