Unipolar Induction Revisited: New Experiments and the “Edge Effect” Theory

Abstract

A brief historical review is made of the 180-year-old debate on Faraday's unipolar inductor. By introducing two convenient modifications of Faraday's original experiment of 1832, pertinent answers are experimentally found to the most debated problems: 1) Can Faraday's law be used? Yes; 2) Do the magnetic field lines rotate when the magnet rotates? No. 3) Can the seat of induction be unambiguously determined? Yes. 4) Is there a fundamental difference between rotational and translational motional induction? Yes: the "edge effect", whereby a negative field appears whenever a magnetic edge moves perpendicularly to itself. An additional experiment is presented to verify the theory. Finally, 5) Can Relativity Theory be applied? The Special Theory, no; the General one, yes.Index Terms-Edge effect, electromagnetic motional induction, relativity theory, seat of emf , unipolar induction.

Inconsistency between the general theory of relativity and the experimental results of Faraday's unipolar inductor

“…The expression for the electromotive force of the relation (3.51) is that of the special theory of relativity. But in Müller's excellent experimental research (in [6]), which deals with the experimental results of EM F measurements of rotating conductors and magnets, it is clear that the special theory of relativity is not consistent with these results. Specifically (in [6], VIII.…”

“…But in Müller's excellent experimental research (in [6]), which deals with the experimental results of EM F measurements of rotating conductors and magnets, it is clear that the special theory of relativity is not consistent with these results. Specifically (in [6], VIII. CONCLUSIONS) it refers: "5) Finally, Special Relativity is applicable to the rectilinearly translating magnet, where the −v ×B resulting from the Lorentz transformation of the fields, cancels the +v × B of the Lorentz force, yielding a net zero result as expected when magnet and wire co-move together.…”

“…The first experiment was conceived and implemented by Faraday in the mid-nineteenth century (1852) and the results of this experiment had as a consequence the revision of his previous views on how electromotive force (EM F ) is induced in a conductor, which moves in a magnetic field. Since then until today, a number of theoretical and experimental works regarding to this subject have been done, based on the electrodynamics of special and general theory of relativity [1,2,3,4,5,6].…”

A Novel Model of Unipolar Induction Phenomena Based on Direct Interaction Between Conductor Charges

“…Since Faraday's discovery [1], unipolar induction has been a controversial phenomenon in electrodynamic theory that is described as paradoxical with competing theories and explanations suggested. To this day, no clear consensus has been reached [2][3][4][5][6][7][8][9], and it remains an interesting topic for debate [4][5][6][7][8]. A general setup of a so-called Faraday-generator is shown in Figure 1, consisting of a cylindrical bar magnet and a conducting disk, across which the induced voltage is measured.…”

An Experimental Study on Unipolar Induction

“…He designed simple and visual experiments, and then obtained conclusion that the M theory is correct [13][14][15]. In 2006, article of He [16] [17,18]. The debate between N theory and M theory continues until now.…”