Magical or magnetic? Less commonly taught facts about real-world permanent magnets and their diverse interactions with objects

TL;DR

This paper explores lesser-known facts about permanent magnets, their complex interactions with objects, and clarifies misconceptions, aiming to deepen understanding beyond basic attraction and repulsion.

Contribution

It provides a detailed analysis of real-world magnetic interactions and clarifies common misconceptions, enhancing educational understanding of permanent magnets.

Findings

Permanent magnets exhibit nonuniform magnetic fields.

Magnetic interactions can be influenced by multiple factors.

Misinterpretations of magnetic tricks often stem from incomplete understanding.

Abstract

Permanent magnets are fascinating. They generate magnetic field and act as the key component in compasses, motors, speakers for practical applications. They are also made into magnetic toys for entertainment and education with magical magnetic tricks. Some of these tricks fueled the recent upsurge for magnetic-responsive objects including but not limited to a LK-99 mixture. A lack of full consideration of the magnetic interactions seems to be the reason why some tricks like "half levitation" is misinterpreted, and the situation is not really rectified in the following replications and discussions. Here I would like to go through some less commonly taught facts about real-world permanent magnets starting from the nonuniformity to their combined effects with other factors. Based on these facts, I will also break down the situation of some examples of how permanent magnets diversely interact even with ordinary objects, as one may have seen from recent sources. I believe this discussion is useful both in an informative and educational way, helping those who want to think deeper about magnetic mechanism beyond a simple attract/repel terminology.