Also you should ask yourself what how to make a steel needle magnetic using a magnet and you will arrive to elementary magnets that might answer some of your questions
The red box is what I’m trying to show you. Translation shouldn’t be a problem.. we can look for the same info in English books if you are interested. nostr:npub1d3hrup0pe8f24c8dysc4gjh2gythrhvasyqh2wd0plvp3v3cnu5qhsfrtn
Also you should ask yourself what how to make a steel needle magnetic using a magnet and you will arrive to elementary magnets that might answer some of your questions
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