Summary
Solutions to some apparent paradoxes in the special theory of relativity are given. In particular it is shown that a static electric fieldE y can produce a forceF x on a moving current element. The solutions are based on the cardinal equations of dynamics of special relativity. A general treatment of such equations is also given both in the microscopical and the macroscopical points of view.
Riassunto
Si trattano le soluzioni di alcuni paradossi apparenti che sorgono nella teoria della relatività ristretta. In particolare si mostra come un campo elettrostaticoE y può produrre una forzaF x su un elemento di corrente in moto. Le soluzioni sono basate sulle equazioni cardinali della dinamica relativistica. Si dà anche una trattazione generale di tali equazioni sia dal punto di vista microscopico che da quello macroscopico.
Резюме
Предлагаются решения некоторых очевидных парадоксов в специальной теории относительности. В частности, показывается, что статическое электрическое полеE y может вызывать силуF x на движущийся элемент тока. Предложенные решения основаны на кардинальных уравнениях динамики специальной теории относительности. Проводится анализ таких уравнений с микроскопической и макроскопической точек зрения.
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References
J. C. Nickerson andR. T. McAdory:Amer. Journ. Phys.,43, 615 (1975).
G. Cavalleri andG. Salgarelli:Nuovo Cimento,62 A, 722 (1969), sect.2.
For the asynchronous formulation seeA. G. Gamba:Amer. Journ. Phys.,35, 83 (1967); for first attempts see alsoH. Arzeliés:Nuovo Cimento,35, 783 (1965);F. Rohrlich:Nuovo Cimento,45 B, 76 (1966). However, these authors have considered the transformations of physical quantities in the asynchronous formulation. That is why these papers gave rise to some criticism (see, for example,T. W. B. Kibble:Nuovo Cimento,41 A, 72 (1966);R. Penney:Nuovo Cimento,43 A, 911 (1966);L. de Broglie:Compt. Rend.,264 B, 1173 (1967);265, 589 (1967)). The general treatment of the asynchronous formulation has been given in ref. (2)G. Cavalleri andG. Salgarelli:Nuovo Cimento,62 A, 722 (1969), sect.2, including the equations of motion for a perfect fluid. The asynchronous statics has been further developed byS. Aranoff:Nuovo Cimento,10 B, 155 (1972);Ø. Grøn:Nuovo Cimento,17 B, 141 (1973);S. Pahor andJ. Strnad:Nuovo Cimento,20 B, 105 (1974);G. Cavalleri,G. Spavieri andG. Spinelli:Lett. Nuovo Cimento,15, 631 (1976);G. Cavalleri, Ø. Grøn, G. Spavieri andG. Spinelli:Amer. Journ. Phys.,46, 108 (1978). An application of the asynchronous dynamics to an accelerated rod can be found inG. Cavalleri andG. Spinelli:Nuovo Cimento,66 B, 11 (1970).
C. Møller:The Theory of Relativity, sect.69 (Oxford, 1969).
G. Spinelli:Nuovo Cimento, B, in press.
G. Cavalleri andG. Spinelli:Nuovo Cimento,66 B, 11 (1970).
This can be accomplished, for example, by two insulating ropes, one standing and the other moving, having opposite charges, as said at the beginning of subsect.3·1. Another way consists in having a single rope with a chargeq on each side and by putting a charge −q on each pulley.
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Work supported by the Consejo de Desarollo Cientifico y Humanistico (C.D.C.H.), U.L.A. (Merida, Venezuela).
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Cavalleri, G., Spavieri, G. & Spinelli, G. Unusual consequences of the cardinal equations of dynamics in special relativity. Nuov Cim B 53, 385–401 (1979). https://doi.org/10.1007/BF02739902
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DOI: https://doi.org/10.1007/BF02739902