Approaches to Electromagnetic Induction

Scanlon, P. J.; Henriksen, R. N.; Allen, Jon

doi:10.1119/1.1975777

Cited by 42 publications

(29 citation statements)

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“…precision agriculture) as described by Corwin and Lesch (2003). Many of these application areas are contained across a wide range of publication outlets such as those related to ground water (Scanlon et al, 1999), soil science (McNeil, 1992, Suddoth et al, 2010, precision agriculture (Sudduth, 2001), soil and water conservation (Doolittle et al, 1994;Kitchen et al, 1996), soil-crop dynamics and silage (Woodbury et al, 2009), environmental quality (Drommerhausen et al, 1995) and the application and movement of agrochemicals (Yoder et al, 2001). The use of such devices, for mapping site-specific attributes, is also incorporated into best-practice documents for land management within the European Community (Adhikari et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Beamish

2011

Journal of Applied Geophysics

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Ground conductivity meters, comprising a variety of coil-coil configurations, are intended to operate within the limits provided by a low induction number (LIN), electromagnetic condition. They are now routinely used across a wide range of application areas and the measured apparent conductivity data may be spatially assembled and examined/correlated alongside information obtained from many other earth science, environmental, soil and land use assessments. The theoretical behaviour of the common systems is examined in relation to both the prevailing level of subsurface conductivity and the instrument elevation. It is demonstrated that, given the inherent high level of accuracy of modern instruments, the prevailing LIN condition may require operation in environments restricted to very low (<12 mS/m) conductivities. Beyond this limit, non-linear departures from the apparent conductivity that would be associated with a LIN condition occur and are a function of the coil configuration, the instrument height and the prevailing conductivity. Using both theory and experimental data, it is demonstrated that this has the potential to provide biased and spatially distorted measurements. A simple correction procedure that can be applied to the measured data obtained from any of the LIN instruments is developed. The correction procedure would, in the limit of a uniform subsurface, return the same (correct) conductivity, irrespective of the ground conductivity meter used, the prevailing conductivity or the measurement height.

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Section: Introductionmentioning

confidence: 99%

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Beamish

2011

Journal of Applied Geophysics

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“…[9][10][11] The disk connects to an ammeter via brushes, one of which makes electrical contact with the rim of the disk and the other with the conducting axle of the disk. Consider the disk shown in Fig.…”

Section: Power Dissipation In the Homopolar Generatormentioning

confidence: 99%

Energy conservation and Poynting's theorem in the homopolar generator

Chyba¹,

Hand²,

Thomas³

2015

American Journal of Physics

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Most familiar applications of Poynting's theorem concern stationary circuits or circuit elements. Here, we apply Poynting's theorem to the homopolar generator, a conductor moving in a background magnetic field. We show that the electrical power produced by the homopolar generator equals the power lost from the deceleration of the rotating Faraday disk due to magnetic braking and review the way that magnetic braking arises within Poynting's theorem.

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“…Una explicación cualitativa y rigurosa puede encontrarse en el artículo de Layton y Simon [18] que muestra la necesidad de considerar la superficie de integración como la superficie barrida por el circuito móvil en un intervalo de tiempo. Esta dificultad en el análisis de la variación de la superficie que atraviesa el flujo magnético en la ley de Faraday también ha sido analizada en otros trabajos de investigación, mostrando que en aquellas situaciones donde una parte del circuito es móvil es necesario considerar la variación delárea barrida por este movimiento al aplicar la ley de Faraday [19,20].…”

Section: Comprensión De Los Estudiantes De La Ley De Faraday En Fenómunclassified

Dificultades de los estudiantes universitarios en el aprendizaje de la inducción electromagnética

Guisasola

Almudí

Zuza

2010

Rev. Bras. Ensino Fís.

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Este trabajo trata de las concepciones de los estudiantes de primer y tercer curso de universidad sobre la teoría de inducción electromagnética. En esta investigación analizamos la parte de la física correspondiente a la ley de Faraday de la inducción electromagnética dentro de la física clásica. La pregunta de investigación que ha orientado el trabajo es: ¿cuáles son las concepciones y formas de razonamiento de los estudiantes universitarios de ciencias e ingeniería sobre la inducción electromagnética? Hemos encontrado que muy pocos estudiantes son capaces de explicar dichos fenómenos de acuerdo con el modelo de la física clásica tanto en términos de campo (nivel macroscópico), como en términos de las acciones ejercidas por el campo (nivel microscópico). Palavras-clave: inducción electromagnética, dificultades de aprendizaje, educación universitaria.The work presented deals with the ideas of first-year Engineering students and third year Physics students about the theory of electromagnetic induction (EI). In this investigation we analyse that part of the theory of EI relating to Faraday's law which comes within the basic analysis of induction phenomena for introductory physics courses within classical physics. In this work, the following research question arise: what conceptions and forms of reasoning do university science and engineering students use in explanations of electromagnetic induction phenomena? We found that very few students are able to distinguish between macroscopic levels described in terms of fields and microscopic levels described in terms of the actions of fields.

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Approaches to Electromagnetic Induction

Cited by 42 publications

References 0 publications

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Energy conservation and Poynting's theorem in the homopolar generator

Dificultades de los estudiantes universitarios en el aprendizaje de la inducción electromagnética

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