Editing Magnetic monopole (section)

=== Early science and classical physics ===

Many early scientists attributed the magnetism of [[lodestone]]s to two different "magnetic fluids" ("effluvia"), a north-pole fluid at one end and a south-pole fluid at the other, which attracted and repelled each other in analogy to positive and negative [[electric charge]].<ref>{{cite web |url=https://books.google.com/books?id=N1YEAAAAYAAJ&pg=PA352 |title=The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and General Information |first=Hugh |last=Chisholm |date=June 26, 2018 |publisher=[Cambridge] University Press |via=Google Books}}</ref><ref>{{cite web |url=https://books.google.com/books?id=6rYXAAAAIAAJ&pg=PA424 |title=Principles of Physics: Designed for Use as a Textbook of General Physics |first=William Francis |last=Magie |date=June 26, 2018 |publisher=Century Company |via=Google Books}}</ref> However, an improved understanding of [[electromagnetism]] in the nineteenth century showed that the magnetism of lodestones was properly explained not by magnetic monopole fluids, but rather by a combination of [[electric current]]s, the [[electron magnetic moment]], and the [[magnetic moment]]s of other particles. [[Gauss's law for magnetism]], one of [[Maxwell's equations]], is the mathematical statement that magnetic monopoles do not exist. Nevertheless, [[Pierre Curie]] pointed out in 1894<ref>{{cite journal |author=Pierre Curie |title=Sur la possibilité d'existence de la conductibilité magnétique et du magnétisme libre |language=fr |trans-title=On the possible existence of magnetic conductivity and free magnetism |journal=Séances de la Société Française de Physique |place=Paris |pages=76–77 |year=1894 |url=https://archive.org/stream/sancesdelasocit19physgoog#page/n82/mode/2up }}</ref> that magnetic monopoles ''could'' conceivably exist, despite not having been seen so far.