Weighting magnetic interactions

Bonanno, A; Bozzo, Giacomo; Camarca, M.; Sapia, P.

doi:10.1088/0031-9120/44/6/f03

Cited by 7 publications

(12 citation statements)

References 5 publications

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“…As expected, the interaction strength between discs tends towards that of the point-like poles for small values of the a/h ratio, corresponding to the case where discs are far away from each other with respect to their radius (see figure A2). At this point, in order to validate the described model for magnetic interactions, let us focus further considerations on the interaction between small cylindrical magnets and ferromagnetic spheres, given that the didactical value of these Geomag components has been widely pointed out in the literature [1,4,5,20]. The analysis proposed may also be seen as a simple experimental direct confirmation that the method of images works correctly.…”

Section: Magnetic or Electrically Charged Discs Versus Point Poles Or...mentioning

confidence: 90%

“…Inexpensive experiments on magnetic interactions, based on Geomag toy components, are largely recognized as educationally significant activities. In this perspective, many simple and effective learning paths, either qualitative or quantitative, have been proposed in the literature [1,4,20]. Moreover, this system provides the context for a simple, but remarkable, example of a phenomenon well known in quantum field theory (QFT), where the attractive or repulsive character of an interaction depends on the 'medium' (possibly the spacetime itself) through which the same interaction 'propagates' (recently an analogy has been proposed for the Higgs particle [21]).…”

Section: Magnetostatic Implementation Of the Methods Of Imagesmentioning

confidence: 99%

“…In particular, the well-known method of images of electrostatics [3] is applied to the magnetostatic interaction among small magnets and a ferromagnetic sphere, both obtained from a kit of the popular Geomag TM toy. The theoretical predictions so attained are compared with the experimental results obtained by using a simple apparatus recently described in the literature [4]. The treatment given here is more general, systematic and teaching-oriented than other previous works on this theme [5][6][7][8].…”

Section: Introductionmentioning

confidence: 94%

“…Moreover, the discussion of the proposed modelling of the system provides an opportunity to emphasize some crucial aspects of idealization procedures, often used in the description of a physical system. Finally, an interactive Java tutorial already proposed by us [14] 1 is suggested to elucidate the qualitative details of the interaction between the magnets and the sphere, paying particular attention to the visual explanation of the so-called Geomag paradox [1] about the attraction between two magnetic like-poles when properly faced through a ferromagnetic body.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic interactions and the method of images: a wealth of educational suggestions

2011

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Under some conditions, the method of images (well known in electrostatics) may be implemented in magnetostatic problems too, giving an excellent example of the usefulness of formal analogies in the description of physical systems. In this paper, we develop a quantitative model for the magnetic interactions underlying the so-called Geomag™ paradox and describe a quantitative experimental investigation to validate the model. The validity ranges of some approximations involved in this problem are quantitatively discussed and the advantages of a dimensionless formulation of the interaction are pointed out. This work offers many educational suggestions suitable for university students.

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Section: Magnetic or Electrically Charged Discs Versus Point Poles Or...mentioning

confidence: 90%

Section: Magnetostatic Implementation Of the Methods Of Imagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Magnetic interactions and the method of images: a wealth of educational suggestions

2011

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“…Many researches in recent decades have shown how experimental activities are significant sources of knowledge in physics teaching/learning practice, since they offer students the chance to contextualize abstract concepts and to challenge their naïve beliefs [1][2][3]. In the case of electromagnetic phenomena, the main difficulties encountered by students are clearly identified in the literature [4][5][6][7] and in recent years several studies have been published focusing on experimental activities as a means to enhance the students' conceptual understanding [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Experiments and models about the force between permanent magnets: asymptotic analysis of a difficult problem

Onorato

Malgieri

2020

Eur. J. Phys.

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We propose a simple experiment which allows students to explore quantitatively the magnetic interaction between neodymium cylindrical magnets. The experiment employs a precision digital balance, two screws with known thread pitch and two transparent tubes to measure the repulsive force between two magnets as a function of their distance. Different measurements are performed, focusing on the behaviour of the interaction force at short and large distances and the role of the magnets' aspect ratio. We discuss the comparison between theoretical expectations resulting from conceptually simple approximate models and experimental results. The experiments employ inexpensive materials and address a relevant topic in the physics curriculum; thus, they are appropriate for the undergraduate physics laboratory, for advanced high school students, and in the context of teacher education and in-service training to enhance students' knowledge of magnetism.

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Work–energy theorem and friction forces: two experiments

et al. 2016

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Several studies have showed the subsistence, even in students enrolled in scientific degree courses, of spontaneous ideas regarding the motion of bodies that conflict with Newton’s laws. One of the causes is related to the intuitive preconceptions that students have about the role of friction as a force. In fact, in real world novices do not recognise friction as a force, and for this reason they may believe that a motion with a constant speed needs as a necessary condition the presence of a constant force in the same direction of the motion. In order to face these ‘intuitive ways of reasoning’, in this paper we propose two sequential experiments that can allow undergraduate students to clarify the role of friction forces through the use of the work–energy theorem. This is a necessary first step on the way to a deeper understanding of Newton’s second law. We have planned our experiments in order to strongly reduce quantitative difficult calculations and to facilitate qualitative comprehension of observed phenomena. Moreover, the proposed activities represent two examples of the recurring methodology used in experimental practices, since they offer the possibility to measure very small physical quantities in an indirect way with a higher accuracy than the direct measurements of the same quantities.

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Weighting magnetic interactions

Cited by 7 publications

References 5 publications

Magnetic interactions and the method of images: a wealth of educational suggestions

Magnetic interactions and the method of images: a wealth of educational suggestions

Experiments and models about the force between permanent magnets: asymptotic analysis of a difficult problem

Work–energy theorem and friction forces: two experiments

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