Electromagnetic induction is a relevant topic in upper secondary school for its role in recognizing the link
between electricity and magnetism, on the theoretical point of view as well as on the experimental evidence
one, for the different technological applications of it in many context, also of the everyday life. Learning
problems documented in literature are related to a partial vision of the phenomena, or to a lack in a deep
comprehension of the phenomena and the processes involved, or more often in the comprehension of the
role of the flux of magnetic B field as organizer of the phenomenology. In the context of the European
Projects MOSEM2 a set of experimental activities integrated with computer modeling was designed on
electromagnetic induction. The experimental proposals based on computer-interface-sensors systems to
acquire data and construct graphs in real time. It aims to create a context in which students have
experience of electromagnetic phenomena, recognizing flux of B field as the quantity always involved in this
phenomenology and for this reason the quantity used to describe and to interpret it. A modeling activity
related to the experimental one aims to overcome a qualitative approach to the phenomenology and it give
to students the opportunity to recognize the role of induction in the dynamical evolution of the observed
systems. The set of experiment suggests a path in which the exploration of the B field produced by the
magnet is strictly correlated to the exploration of the electromagnetic induction phenomena. Measurements
are made using a commercial Hall effect B field probe as well as using a very simple home made B
fluxmeter. The modeling activity related to the experimental one is proposed in two main context. The first
concern the magnet falling into a coils and is based on the equivalence of the B field produced by a magnet
and by a coil, with opportune dimension and current. The second one is the role of induction in circuits
single on coupled when the transient processes are studied.
