Electromagnet and Magnet Strength Comparison

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With Core

Electromagnet with a core can be stronger. https://www.supermagnete.de/eng/faq/What-is-the-difference-between-a-permanent-magnet-and-an-electromagnet

Stronger than Neodymium magnets, but larger - https://www.quora.com/Are-electromagnets-stronger-than-the-same-volume-of-N52-neodymium-magnets

Coreless

Can a coreless electromagnet be stronger than a magnet?

Paper - tapered coreless is preferred geometry - [1]

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