Electromagnetic phenomena offer a context in which students could address the investigation of the physical reality using multivariable abstract elements representing theoretical syntesis. The role played by the flux of the magnetic field in that description is pivotal but at the same time its interpretation represents an important learning knot that students had to face. To explore this physical quantity, a computer on-lie Real Time Laboratorial (RTL) activity was developed and proposed to Italian high school students in the framework of the development of vertical Inquired Based Learning path. The formal nature of the magnetic field flux is constructed step by step starting from the exploration of simple hands-on activities on the interaction of magnets with different materials and developed thought measure of magnetic field to reach the interpretation of the electromagnetic induction. A compass as explorer of magnetic properties in the space around a magnet is used to represent magnetic field lines. The identification of the vector nature of the magnetic field distinguishing this entity from a the forces prelude the visualization by means of a flux tubes representation of the magnetic field which is built from the field line representation in a framework in which the role of experiment founded the formal role of the entity and the formal representation and the critical analysis of them provide new more refined interpretative tools that could be applied in different, more general, contexts. The core activities of the investigation of the magnetic field flux is focused on the discussion with students on the experimental explorations of the relationship between magnetic field value and relative tube flux section. The experimental activity and the analysis of the learning outcomes and reasoning that the proposed activities promotes in secondary students will be presented and discussed. Data presented from students referred to four different activities held with different groups of high school students: 1) 5th class of experimental scientific lyceum, 2) 5th class of scientific lyceum; 3) 5th class of a classic lyceum; 4) a selection of the Italian best student coming from all of the 4th and 5th classes of all the Italian high schools. Looking in particular to the role of the angle of attach to flux proposed, it emerge a crucial step in which pupils identify a constant quantity of the system that is related to a multivariable abstract entity which is the flux. In this way the role of the rigor and the inner coherence adopted in the learning path allow students to address the exploration of the phenomenology and its analysis in a systematic way constructing the formal representation of the physical entity involved. © Institute of Mathematics and Physics, Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava.
Phenomena exploration to build the concept of magnetic field flux
Michelini M.;
2013-01-01
Abstract
Electromagnetic phenomena offer a context in which students could address the investigation of the physical reality using multivariable abstract elements representing theoretical syntesis. The role played by the flux of the magnetic field in that description is pivotal but at the same time its interpretation represents an important learning knot that students had to face. To explore this physical quantity, a computer on-lie Real Time Laboratorial (RTL) activity was developed and proposed to Italian high school students in the framework of the development of vertical Inquired Based Learning path. The formal nature of the magnetic field flux is constructed step by step starting from the exploration of simple hands-on activities on the interaction of magnets with different materials and developed thought measure of magnetic field to reach the interpretation of the electromagnetic induction. A compass as explorer of magnetic properties in the space around a magnet is used to represent magnetic field lines. The identification of the vector nature of the magnetic field distinguishing this entity from a the forces prelude the visualization by means of a flux tubes representation of the magnetic field which is built from the field line representation in a framework in which the role of experiment founded the formal role of the entity and the formal representation and the critical analysis of them provide new more refined interpretative tools that could be applied in different, more general, contexts. The core activities of the investigation of the magnetic field flux is focused on the discussion with students on the experimental explorations of the relationship between magnetic field value and relative tube flux section. The experimental activity and the analysis of the learning outcomes and reasoning that the proposed activities promotes in secondary students will be presented and discussed. Data presented from students referred to four different activities held with different groups of high school students: 1) 5th class of experimental scientific lyceum, 2) 5th class of scientific lyceum; 3) 5th class of a classic lyceum; 4) a selection of the Italian best student coming from all of the 4th and 5th classes of all the Italian high schools. Looking in particular to the role of the angle of attach to flux proposed, it emerge a crucial step in which pupils identify a constant quantity of the system that is related to a multivariable abstract entity which is the flux. In this way the role of the rigor and the inner coherence adopted in the learning path allow students to address the exploration of the phenomenology and its analysis in a systematic way constructing the formal representation of the physical entity involved. © Institute of Mathematics and Physics, Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
