1,720,974 research outputs found
Comment On "experimental Proof Of Standard Electrodynamics By Measuring The Self-force On A Part Of A Current Loop"
No full textWe discuss the paper of Cavalleri et al. [Phys. Rev. E 58, 2505 (1998)] on the measurement of a force on part of a closed circuit carrying a constant current. ©2000 The American Physical Society.625 B7544Cavalleri, G., Bettoni, G., Tonni, E., Spavieri, G., (1998) Phys. Rev. E, 58, p. 2505Moyssides, P.G., (1989) IEEE Trans. Magn., 25, p. 4313Moyssides, P.G., (1989) IEEE Trans. Magn., 25, p. 4298Moyssides, P.G., (1989) IEEE Trans. Magn., 25, p. 4307Assis, A.K.T., Bueno, M.A., (1996) IEEE Trans. Magn., 32, p. 431Jolly, D.C., (1985) Phys. Lett., 107 A, p. 231Ternan, J.G., (1985) J. Appl. Phys., 57, p. 1743Ternan, J.G., (1985) J. Appl. Phys., 58, p. 3639Christodoulides, C., (1987) J. Phys. A, 20, p. 2037Christodoulides, C., (1988) Am. J. Phys., 56, p. 357Peoglos, V., (1988) J. Phys. D, 21, p. 1055Christodoulides, C., (1989) Phys. Lett. A, 141, p. 383Strnad, J., (1989) Eur. J. Phys., 10, p. 276Strnad, J., (1989) Phys. Lett. A, 137, p. 11Bueno, M., Assis, A.K.T., (1997) Phys. Scr., 56, p. 554Bueno, M., Assis, A.K.T., (1997) Can. J. Phys., 75, p. 357Bueno, M., Assis, A.K.T., (1998) Calcula de Indutância e de Força em Circuitos Elétricos, , Editora da UFSC/Editora da UEM, FlorianópolisDe Bueno, M.A., Assis, A.K.T., (1998) IEEE Trans. Magn., 34, p. 31
The Electric Field Outside And Inside A Resistive Spherical Shell Carrying A Steady Azimuthal Current
No full textThe potential, electric field and surface charges outside and inside a resistive spherical shell carrying a steady azimuthal current were calculated. The medium inside and outside the spherical shell was supposed to be air or vacuum. A time-independent electric field different from zero in both regions was obtained. The surface charge density was obtained by the standard procedure of taking the radial components of the external and internal electric fields.722-3212217Sommerfeld, A., (1964) Electrodynamics, , Academic Press. New YorkJetimenko, O.D., (1989) Electricity and Magnetism, , (Electret Scientific Company, Star City), 2nd edJackson, J.D., (1996) Am. J. Phys., 64, p. 855Assis, A.K.T., Cisneros, J.I., (1998) Open Questions in Relativistic Physics, pp. 177-185. , (edited by F. Selleri), (Apeiron, Montreal)Griffiths, D.J., (1999) Introduction to Electrodynamics, , (Prentice Hall, New Jersery), 3rd edAssis, A.K.T., Cisneros, J.I., (2000) IEEE Trans. Circ. Sys. I, 47, p. 63Heald, M.A., (1984) Am. J. Phys., 52, p. 522Stratton, J.A., (1941) Electromagnetic Theory, , McCraw-Hill, New YorkAssis, A.K.T., Mania, A.J., (1999) Rev. Bras. Ens. Fís., 21, p. 469Assis, A.K.T., Rodrigues Jr., W.A., Mania, A.J., (1999) Found. Phys., 29, p. 729Assis, A.K.T., Hernandes, J.A., Lamesa, J.E., (2001) Found. Phys., 31, p. 1501Hernandes, J.A., Assis, A.K.T., (2003) Am. J. Phys., 71, p. 938Hernandes, J.A., Assis, A.K.T., (2003) Phys. Rev. E, 68, p. 046611Moon, P., Spencer, D.E., (1988) Field Theory Handbook, , Springer-Verlag, Berlin 2nd edArfken, G.B., Weber, H.J., (1995) Mathematical Methods for Physicists, , (Academic Press, San Diego), 4th edLeung, K.W., (2000) IEEE Trans. Antennas Propagat., 48, p. 961Jackson, J.D., (1975) Classical Elecrodynamics, , (John Wiley, New York), 2nd e
Circuit Theory In Weber Electrodynamics
Full text linkWe present a derivation of the equation describing the current flow in a circuit with self-inductance based on Newton's second law plus the Weber force or, alternatively, plus the Lorentz or Liénard-Schwarzschild force. In Weber's approach the self-inductance can be treated as a measure of the effective average inertial mass of the conduction electrons.183241246Assis, A.K.T., (1994) Weber's Electrodynamics, , Dordrecht: KluwerHeald, M.A., Marion, J.B., (1995) Classical Electromagnetic Radiation 3rd Edn, 41, pp. 1-34. , Fort Worth: Saunders problemReitz, J.R., Milford, F.J., Christy, R.W., (1980) Foundations of Electromagnetic Theory 3rd Edn, , (Reading, MA: Addison-Wesley) section 7.7Grover, F.W., (1946) Inductance Calculations - Working Formulas and Tables, 35. , New York: Van NostrandBueno, M.A., Assis, A.K.T., A new method for inductance calculations (1995) J. Phys. D: Appl. Phys., 28, pp. 1802-1806O'Rahilly, A., (1965) Electromagnetic Theory - A Critical Examination of Fundamentals, pp. 215-223. , New York: DoverPearson, J.M., Kilambi, A., Velocity-dependent nuclear forces and Weber's electrodynamics (1974) Am. J. Phys., 42, pp. 971-975Edwards, W.F., Kenyon, C.S., Lemon, D.K., Continuing investigation into possible electric fields arising from steady conduction currents (1976) Phys. Rev. D, 14, pp. 922-938Assis, A.K.T., Weber's law and mass variation Phys (1989) Lett., 136 A, pp. 277-280Assis, A.K.T., Caluzi, J.J., A limitation of Weber's law (1991) Phys. Lett., 160 A, pp. 25-30Assis, A.K.T., Centrifugal electrical force (1992) Commun Theor. Phys., 18, pp. 475-478Assis, A.K.T., Changing (he inertia) mass of a charged particle (1993) J. Phys. Soc. Japan, 62, pp. 1418-142
Deriving Force From Inductance
No full textThe correctness of calculating the force on current carrying circuits by taking the derivative of the inductance coefficient of the circuits is shown even in the case of a single closed circuit, contrary to the opinion of some authors. This demonstration is illustrated with the force exerted by a cylinder with poloidal current on an infinitesimal strip belonging to the same cylinder. The force is calculated directly from the force expressions and also by differentiating the self-inductance of the cylinder. This result is another proof of the equivalence between Ampère and Grassmann's forces. © 1998 IEEE.341 PART 2317319Assis, A.K.T., Bueno, M., Equivalence between Ampère and Grassmann's forces (1996) IEEE Trans. Magn., 32, pp. 431-436Assis, A.K.T., (1994) Weber's Electrodynamics, , Dordrecht: KluwerBueno, M., Assis, A.K.T., A new method for inductance calculations (1995) J. Phy. D, Appl. Phys., 28, pp. 1802-1806Peoglos, V., Measurement of the magnetostatic force of a current circuit on a part of itself (1988) J. Phys. D, Appl Phys., 21, pp. 1055-1061Grover, F.W., (1946) Inductance Calculations - Working Formulas and Tables, , New York: Van NostrandKnowlton, A.E., (1949) Standard Handbook for Electrical Engineers, , New York: McGraw HillWesley, J.P., On Peoglos' measurement of the force on a portion of a current loop due to the remainder of the loop (1989) J. Phys. D, Appl. Phys., 22, pp. 849-850Graneau, P., (1985) Ampere-Neumann Electrodynamic of Metals, , Nonantum: HadronicGradshteyn, I.S., Ryzhik, I.M., (1994) Table of Integrals, Series, and Products, 5th Ed., , New York: AcademicTricker, R.A.R., (1965) Early Electrodynamics - The First Law of Circulation, , New York: Pergamo
Didactic Demonstration Of The Interaction Between Electric Currents [demonstração Didática De Interação Entre Correntes Elétricas]
No full textWe present the first crucial experiment by Ampère that shows the interaction of two metallic wires carrying steady currents. We discuss its importance in the history of physics. We also present a modern reproduction of the procedures and observations of Ampère with low cost materials. Copyright by the Sociedade Brasileira de Física.294605612Oersted, H.C., Cadernos de História e Filosofia da (1986) Ciência, 10, p. 115Chaib, J.P.M.C., Assis, A.K.T., (2007) Revista Brasileira de Ensino de Física, 29, p. 41Ampère, A.-M., (1822) Annales de Chimie et de Physique, 20, p. 60J. Lühr, Im Labor der Physikgeschichte - Zur Untersuchung historischer Experimentalpraxis, edited by P. Heering, F. Rießand C. Sichau (BIS der Carl von Ossietzky, Oldenburg, 2000), p. 135-156E.T. Whittaker, A History of the Theories of Aether and Electricity, v. 1: The Classical Theories (Humanities Press, Nova Iorque, 1973)Biot, J.B., Savart, F., (1820) Annales de Chimie et de Physique, 15, p. 222Ampère, A.-M., (1820) Annales de Chimie et de Physique, 15, p. 170. , http://www.ampere.cnrs.fr, Available atA.-M. Ampère, Théorie Mathématique des Phénomènes Électro-dynamiques Uniquement Déduite de l'Expérience (Editions Jacques Gabay, Sceaux, 1990). Réimpression du Mémoire fondamental d'André-Marie Ampère paru en 1827 dans les, Mémoires de l'Académie Royale des Sciences de l'Institut de France, année 1823, Tome VI, p. 175-388Ampère, A.-M., (1820) Annales de Chimie et de Physique, 15, p. 59. , http://www.ampere.cnrs.fr, Available a
On Absolute And Relative Motions In Physics
No full textThe authors present the Newtonian definitions of absolute and relative motion. The idea is defended that only relative motions of matter relative to matter can be detected and lead to measurable effects. Phenomena is analyzed depending on velocity and acceleration in electromagnetism and mechanics.64812Assis, A.K.T., (1994) Weber's Electrodynamics, , Kluwer, Dordrecht, ISBN: 0-7923-3137-0Assis, A.K.T., (1999) Relational Mechanics, , Apeiron, Montreal, ISBN: 0-9683689-2-1Assis, A.K.T., Thober, D.S., Unipolar induction and Weber's electrodynamics (1994) Frontiers of Fundamental Physics, pp. 409-414. , M. Barone and F. Selleri (editors), (Plenum Press, New York)Bueno, M.D.A., Assis, A.K.T., (2001) Inductance and Force Calculations in Electrical Circuits, , Nova Science Publishers, Huntington, New York, ISBN: 1-56072-917-1Galeczki, G., The limit speed and Weber's potential (1993) Physics Essays, 6, p. 86Galeczki, G., Marquardt, P., Über die longitudinalen Ampèreschen Kräfte und Webers Elektro-dynamik (1995) Fusion, 16, p. 15Guala-Valverde, J., Gravitational Mutual Energy in Weber-type Mechanics (1998) Physics Essays, 11, pp. 164-165Guala-Valverde, J., Inertial Mass in Mach-Weber-Assis Theory (1999) Apeiron, 6, pp. 202-204Guala-Valverde, J., (1999) Inercia y Gravitacion, , Fundacion Julio Palacios, Neuquén, with the collaboration of J. Tramaglia and R. Rapacioli, ISBN: 987-97703-0-7Guala-Valverde, J., Mazzoni, P., The Unipolar Dynamotor: A Genuine Relational Engine (2001) Apeiron, 8, pp. 41-52Guala-Valverde, J., Mazzoni, P., Achilles, R., The Homopolar Motor: A True Relativistic Engine (2002) American Journal of Physics, 70, pp. 1052-1055Guala-Valverde, J., Spinning Magnets and Relativity: Jehle vs. Bartlett (2002) Physica Scripta, 66, pp. 252-253Kelly, A.G., Experiments on Unipolar Induction (1999) Physics Essays, 12, pp. 372-382Kinzer, E.T., Fukai, J., Weber's Force and Maxwell's Equations (1996) Foundations of Physics Letters, 9, pp. 457-461Mach, E., (1960) The Science of Mechanics - A Critical and Historical Account of Its Development, , Open Court, La SalleMikhailov, V.F., The Action of an Electrostatic Potential on the Electron Mass (1999) Annales de la Fondation Louis de Broglie, 24, pp. 161-169Mikhailov, V.F., Influence of an Electrostatic Potential on the Inertial Electron Mass (2001) Annales de la Fondation Louis de Broglie, 26, pp. 33-38Newton, I., (1934) Mathematical Principles of Natural Philosophy, , University of California Press, BerkeleyPhipps Jr., T.E., Derivation of a Modernized Weber Force Law (1992) Physics Essays, 5, pp. 425-428Sokolskii, A.G., Sadovnikov, A.A., Lagrangian Solutions for Weber's Law of Attraction (1987) Soviet Astronomy (Astronomical Journal), 31, pp. 90-93Wesley, J.P., Weber Electrodynamics, Part I: General Theory, Steady Current Effects (1999) Fondations of Physics Letters, 3, pp. 443-46
Ampère's Motor: Its History And The Controversies Surrounding Its Working Mechanism
No full textIn 1822 Ampère created a new kind of motor when he succeeded in spinning a cylindrical magnet around its axis by connecting it to a battery generating a steady current. Nowadays, it is easy to present such a motor in the classroom utilizing a neodymium magnet, a D battery, a steel nail, and a short piece of copper wire. Although it is very simple to observe the rotation, the explanation of this effect is still under dispute. This work presents the history of this motor including the controversy between Ampère and Faraday, as well as the modern explanation based on the field concept. We emphasize the positive outcomes to be gained in the classroom by presenting this device to students. © 2012 American Association of Physics Teachers.8011990995Matthews, M., (1994) Science Teaching: The Role of History and Philosophy of Science, , (Routledge, New York)Chiaverina, C., The simplest motor? (2004) Phys. Teach., 42, p. 553. , 10.1119/1.1828728Schlichting, H.J., Ucke, C., Der einfachste Elektromotor der Welt (2004) Phys. Unserer Zeit, 35, pp. 272-273. , 10.1002/piuz.200401057Munoz, A.M., Motor homopolar (2007) Revista Eureka sobre Enseñanza y Divulgación de las Ciencias, 4, pp. 352-354Stewart, S.M., Some simple demonstration experiments involving homopolar motors (2007) Rev. Bras. Ensino de Física, 29, pp. 275-281Wong, H.K., Levitated homopolar motor (2009) Phys. Teach., 47, p. 124. , 10.1119/1.3072465Wong, H.K., Motional mechanisms of homopolar motors & rollers (2009) Phys. Teach., 47, pp. 463-465. , 10.1119/1.3225512Schlichting, H.J., Ucke, C., A fast, high-tech, low cost electric motor construction (2004) Phys. Unserer Zeit, 35, pp. 272-273. , http://users.physik.tu-muenchen.de/cucke/english.htm, english translation by J. Williams, available atFaraday, M., On some new electro-magnetical motions, and on the theory of magnetism (1821) Q. J. Sci. Lit. Arts, 12, pp. 74-96Faraday, M., Faraday, M., On some new electro-magnetical motions and on the theory of magnetism (1821) Quarterly Journal of Science, 12, pp. 74-96. , R. M. Hutchins, edited by (Encyclopaedia Britannica, Chicago), Vol. 45 reprint of theFaraday, M., Description of an electro-magnetical apparatus for the exhibition of rotatory motion (1822) Q. J. Sci. Lit. Arts, 12, pp. 283-285Hottecke, D., How and what can we learn from replicating historical experiments? A case study (2000) Sci. Educ., 9, pp. 343-362. , 10.1023/A:1008621908029Ampère, A.-M., Expériences relatives à de nouveaux phénomènes électro-dynamiques (1822) Ann. Chim. Phys., 20, pp. 60-74Ampère, A.-M., Exposé sommaire des nouvelles Expériences électro-magnétiques faites par différens Physiciens, depuis le mois de mars 1821, lu dans la séance publique de l'Académie royale des Sciences, le 8 avril 1822 (1822) in Recueil d'Observations Électro-dynamiques, pp. 199-206. , A.-M. Ampère, edited by (Crochard, Paris) Despite this date, the volume of the Recueil was only published in 1823Ampère, A.-M., Exposé sommaire des nouvelles expériences électromagnétiques faites par différens Physiciens, depuis le mois de mars 1821, lu dans la séance publique de l'Académie royale des Sciences, le 8 avril 1822 (1885) Collection de Mémoires relatifs a la Physique II: Mémoires sur l'Électrodynamique, pp. 238-244. , J. Joubert, (Gauthier-Villars, Paris)Ampère, A.-M., Expériences relatives aux nouveaux phénomènes électro-dynamiques que j'ai obtenus au mois de décembre 1821 (1822) Recueil d'Observations Électro-dynamiques, pp. 237-250. , A.-M. Ampère, in , edited by (Crochard, Paris) Despite this date, the volume of the Recueil was only published in 1823Ampère, A.-M., Expériences relatives aux nouveaux phénomènes électro-dynamiques obtenus au mois de décembre 1821 (1885) Collection de Mémoires relatifs a la Physique II: Mémoires sur l'Électrodynamique, pp. 192-204. , J. Joubert, in , edited by (Gauthier-Villars, Paris)Ampère, A.-M., Mémoire sur la Détermination de la formule qui représente l'action mutuelle de deux portions infiniment petites de conducteurs voltaïques. Lu à l'Académie royale des Sciences, dans la séance du 10 juin 1822 (1822) Ann. Chim. Phys., 20, pp. 398-421Blondel, C., Ampère, A.-M., (1982) la Création de l'Électrodynamique (1820-1827), , (Bibliothèque Nationale, Paris)Hofmann, J.R., (1996) André-Marie Ampère, Enlightenment and Electrodynamics, , (Cambridge U.P., Cambridge)Assis, A.K.T., (1994) Weber's Electrodynamics, , (Kluwer Academic Publishers, Dordrecht)Bueno, A., Assis, A.K.T., (2001) Inductance and Force Calculations in Electrical Circuits, , (Nova Science Publishers, Huntington, NY, ).,d.MAssis, A.K.T., Hernandes, J.A., (2007) The Electric Force of a Current: Weber and the Surface Charges of Resistive Conductors Carrying Steady Currents, , http://www.ifi.unicamp.br/~assis, (Apeiron, Montreal, ), available at(1943) Correspondence du Grand Ampère, 3. , L. d. Launay, edited by (Gauthier Villars, Paris)(1936) Correspondence du Grand Ampère, 2. , L. d. Launay, edited by (Gauthier Villars, Paris)D'après ces faits, j'ai déterminé un principe fondamental, évident en physique, c'est que, l'action étant toujours égale à la réaction, il est impossible quthomAmpère, A.-M., Nouvelles expériences électro-magnétiques de MM. Faraday, Ampère, H. Davy, et De La Rive (1822) Bull. Sci. Soc. Philomatique Paris, 9, pp. 21-23Featonby, D., Inspiring experiments exploit strong attraction of magnets (2006) Physics Educ., 41, pp. 292-295. , 10.1088/0031-9120/41/4/F05Monteiro, M.A.A., Germano, J.S.E., Monteiro, D.I.C.C., Gaspar, A., As atividades de demonstração e a teoria de Vigotski: Um motor elétrico de fácil construção e de baixo custo (2010) Cad. Bras. Ensino Física, 27, pp. 371-38
On The Unification Of Forces Of Nature
No full textDifferent aspects of physical interaction are considered: inertia, gravitation, electrostatics, magnetostatics and galvanism. It is discussed the experimental and theoretical reasons leading to the unification of some of them. It is then explored by analogies what might lead to the unification of gravitation with electromagnetism.27214916
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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