This study maps the process of students' conceptualization of magnetic flux and induction of electric current using visualizations in the MARVLS Augmented Reality App. We also use the mathematical sense making (MSM) framework to map students' reasoning about mathematical relationships within this context. We present this process and content in a series of semi structured think-aloud guided interview questions. Students manipulate the AR visual objects including a copper ring and magnetic field within the AR models to explore their conceptions of magnetic flux and how the direction of induced current is related to changes in magnetic flux. The MSM framework is used to analyze how students manipulate these elements in the AR model to build their conceptual model of electromagnetic induction.
Interview results suggest that AR models of electromagnetic induction within the MARVLS App promotes a deeper and more nuanced understanding of how a change of flux creates an induced current. The results indicate that many students are not sure what flux means and needed scaffolding to determine how to create changes in flux. For example, students were prompted to move a copper ring away from or toward a magnetic field within the visualization, to move the copper ring from left to right through the magnetic field, or to rotate the cube such that the magnetic field lines were rotated about the copper ring. In addition, some students needed additional scaffolding to link the direction of the current to an increasing or decreasing flux. The insights gained during the interviews and analyzed with the MSM framework contribute to curriculum development concerned with using AR models to engage students in physics learning.
http://orcid.org/0000-0001-5971-214X
Purdue University – West Lafayette (College of Engineering)
[biography]
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