Motional emfs and the Hall effect

dc.creator	Doug Bradley-Hutchison
dc.date	2011-12-01T00:00:00Z
dc.date.accessioned	2015-07-20T22:45:28Z
dc.date.available	2015-07-20T22:45:28Z
dc.identifier	1870-9095
dc.identifier	https://doaj.org/article/a5e1ffd871744b7bacb02aee975b225b
dc.identifier.uri	http://evidence.thinkportal.org/handle/123456789/23571
dc.description	When a moving conductor shaped like a rod or wire interacts with a static external magnetic field, two effects conventionally associated with the direct action of magnetic forces arise. The first is an induced emf which in typical textbook accounts is initiated and maintained by a force proportional to the velocity of the conductor. The second is a resistive force, proportional to the induced current, presumed to act on the conduction electrons. We present an alternate theory to explain both effects that relies on an electric field within the conductor that has both transverse and axial components. The transverse field is analogous to the electric field associated with the Hall effect. The Hall fieldacts to transfer energy to the electrons, which generates the emf, and impede the motion of the ions, which is the origin of the resistive force. The combination of the axial field and the magnetic field is shown to act like a velocity selector. This clarifies the role of the magnetic field and avoids confusion about the energy transfer process (i.e. that magnetic forces can do mechanical work).
dc.language	English
dc.language	Spanish
dc.language	Portuguese
dc.publisher	Instituto Politécnico Nacional, Latin American Physics Education Network
dc.relation	http://www.lajpe.org/dec11/LAJPE_593_Doug_Bradley_Hutchison_preprint_corr_f.pdf
dc.relation	https://doaj.org/toc/1870-9095
dc.source	Latin-American Journal of Physics Education, Vol 5, Iss 4, Pp 671-679 (2011)
dc.subject	Electromagnetism
dc.subject	Physics Education
dc.subject	Special aspects of education
dc.subject	LC8-6691
dc.subject	Education
dc.subject	L
dc.subject	DOAJ:Education
dc.subject	DOAJ:Social Sciences
dc.subject	Special aspects of education
dc.subject	LC8-6691
dc.subject	Education
dc.subject	L
dc.subject	DOAJ:Education
dc.subject	DOAJ:Social Sciences
dc.subject	Special aspects of education
dc.subject	LC8-6691
dc.subject	Education
dc.subject	L
dc.subject	Special aspects of education
dc.subject	LC8-6691
dc.subject	Education
dc.subject	L
dc.subject	Special aspects of education
dc.subject	LC8-6691
dc.subject	Education
dc.subject	L
dc.title	Motional emfs and the Hall effect
dc.type	article