The Field of a Rotating Cylindrical Magnet

Rajaraman, K.C.

doi:10.7227/ijeee.45.1.4

Cited by 6 publications

(5 citation statements)

References 2 publications

(2 reference statements)

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“…is why the opposite point of view is sometimes termed 'the bristle theory', whose adherents [18][19][20][21][22][23] believe in the rotation of the magnetic field with the rotating magnet. As for every solid body, the magnetic field possesses a mass energy (with a density proportional to B 2 ) concentrated in a certain domain of space.…”

Section: The Unipolar Generatormentioning

confidence: 99%

“…He also concluded that the rotating magnetic field was a physical reality. More recently, Rajaraman [21] presented good arguments in favour of the effect of the moving field view: 'the moving field theory or bristle theory is not only simpler, but also more logical, more consistent and more economical'. He proposed that quantitative experiments should be carried out but was apparently unaware of previous work [19,22,23].…”

Section: Previous Experimental Workmentioning

confidence: 99%

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On the motion of the field of a permanent magnet

Leus

Taylor

2011

Eur. J. Phys.

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A description is given of a series of recent experiments using a rotating magnetic circuit comprising a permanent magnet ring and yoke, and a stationary conductor in the air gap between the ring and yoke. The EMF induced in this case cannot be described by a simple application of Faraday's flux law. This is because the magnetic flux in the air gap and the area of the gap both remain constant. The experimental results are best explained by the fact that the magnetic field itself rotates with the rotating magnet. This is controversial in the scientific and educational literature, as shown by citations from various authors (e.g. Feynman, Tamm and Landau all disagree, and with each other). However, these experiments, which may be readily reproduced, do in fact settle the question.

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Section: The Unipolar Generatormentioning

confidence: 99%

Section: Previous Experimental Workmentioning

confidence: 99%

On the motion of the field of a permanent magnet

Leus

Taylor

2011

Eur. J. Phys.

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“…More than a century after Lodge this topic remained a subject for controversy between eminent physicists with some Nobel laureates included (Leus & Zatolokin, 2006). Hitherto some highly sophisticated experiments have been suggested and tried (Zajev & Dokuchajev, 1964;Bogach, 1996;Kelly, 2004;Rajaraman, 2008;Leus & Taylor, 2011;, which confirmed the correctness of Lodge's view.…”

Section: The Role Of Vector Potential In Electromagnetic Transmissionmentioning

confidence: 88%

The Physical Entity of Vector Potential in Electromagnetism

Leus¹,

Smith²,

Maher³

2013

APR

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The scalar and vector potentials were introduced into electromagnetic physics in the second half of the nineteenth century. The chief aim was to use them as auxiliary mathematical quantities in order to solve certain practical problems. Nevertheless the discovery of the Aharonov-Bohm effect (1959) in quantum mechanics has suggested that vector potential rather than magnetic field is the causal agent in such an effect. Recent research on the Maxwell-Lodge paradox--induction of voltage in the loop circling a long solenoid carrying alternating current--has confirmed that induction occurs in a region of space effectively free from magnetic field. This again reinforces the idea of vector potential as a physical entity rather than the auxiliary artificial quantity of classical electrodynamics. The present investigation is intended to provide some degree of corroboration of the previous result. The experimental arrangement consists of a 'special' transformer containing movable, single turn coils wound onto rectangular frames. The primary coil is powered from a signal generator providing alternating current over a variable frequency range while the secondary output voltage is connected across a C.R.O./precision voltmeter. Measurements of transformer e.m.f. were carried out at several frequencies in the range 100 Hz-20 kHz and with various conditions of shielding around the primary and secondary coils. Certain additional experiments were carried out with a long solenoid and torus solenoid supplied with different core materials. Experimental results for induced e.m.f's are presented and in special cases correlated with the calculated values of mutual inductance. Overall the results tend to confirm the primacy of vector potential over magnetic field as an explanation of the phenomenon.

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“…. the moving field theory or bristle theory is not only simpler, but also more logical, more consistent and more economical' [3].…”

Section: Magnetic Dipole Moving Through a Circular Loopmentioning

confidence: 99%

The magneto-kinematic effect for the case of rectilinear motion

Taylor

Leus

2012

Eur. J. Phys.

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The magneto-kinematic effect has been previously observed for the case of a rotating permanent magnet. Using this effect, this paper presents a novel method for calculation of the induced electromotive force (EMF) in a conductor for the case of rectilinear motion of a 25.4 mm diameter permanently magnetized sphere (magnetic dipole) past the conductor. Three scenarios are considered: a magnetic dipole moving through a circular conducting loop, a magnetic dipole moving underneath a long conductor with magnetic moment perpendicular to the conductor plane and a moving magnetic dipole with magnetic moment parallel to the conductor plane. In all cases the theoretical time-dependent EMF calculated using the method was in excellent quantitative agreement with the induced EMF measured on an oscilloscope. The new method of calculation is applicable in a range of generic problems dealing with moving sources of magnetic flux. Using this approach a novel neutrino detector is proposed.

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The Field of a Rotating Cylindrical Magnet

Cited by 6 publications

References 2 publications

On the motion of the field of a permanent magnet

On the motion of the field of a permanent magnet

The Physical Entity of Vector Potential in Electromagnetism

The magneto-kinematic effect for the case of rectilinear motion

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