dc.contributor.author Wilson, Marcus T. en_NZ dc.date.accessioned 2021-03-03T23:27:00Z dc.date.available 2021-03-03T23:27:00Z dc.date.issued 2021 en_NZ dc.identifier.citation Wilson, M. T. (2021). Misconceptions arising from the Infinite Solenoid Magnetic Field Formula. The Physics Teacher, 59(3), 213–215. https://doi.org/10.1119/10.0003670 en dc.identifier.issn 0031-921X en_NZ dc.identifier.uri https://hdl.handle.net/10289/14155 dc.description.abstract Many high school and first-year university courses include discussion of the magnetic effect of currents. Frequently discussed textbook examples include long, straight wires, circular current loops, and solenoids, partly because these examples are tractable mathematically. The solenoid naturally leads to discussion on magnetic materials since it is readily demonstrated that a paramagnetic core significantly boosts the strength of an electromagnet. However, magnetic effects of solid and even liquid materials are subtle and confusing¹ and the mathematics is not straightforward. This leads to confusion amongst students (and their teachers), which, when taken to more advanced study, leads to significant misconceptions about the nature of magnetic properties and fields. These misconceptions can become problematic when practical (rather than stereotyped) magnetic design and analysis is required such as for transformers,² magnetic recording materials, geomagnetic sensors,³ or biological stimulators4 to name a few. In this article, I highlight examples of this confusion, in particular the failure in realistic situations of the well-quoted formula for an infinite solenoid with a paramagnetic core, and the physical interpretation of the relative permeability of a material, µr. en_NZ dc.format.mimetype application/pdf dc.language.iso en dc.publisher American Association of Physics Teachers en_NZ dc.title Misconceptions arising from the Infinite Solenoid Magnetic Field Formula en_NZ dc.type Journal Article dc.identifier.doi 10.1119/10.0003670 en_NZ dc.relation.isPartOf The Physics Teacher en_NZ pubs.begin-page 213 pubs.elements-id 259813 pubs.end-page 215 pubs.issue 3 en_NZ pubs.volume 59 en_NZ
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