Electromagnetic Radiation and the Mechanical Reactions, Arising From It, Being an Adams Prize Essay in the University of Cambridge (Classic Reprint)
(Excerpt from Electromagnetic Radiation and the Mechanical...)
Excerpt from Electromagnetic Radiation and the Mechanical Reactions, Arising From It, Being an Adams Prize Essay in the University of Cambridge
The subject proposed for the Adams Prize in 1908 was "The Radiation from Electric Systems or Ions in Accelerated Motion and the Mechanical Reactions on their Motion which arise from it." This also happened to be the subject-matter of several investigations which I had carried out from time to time as preliminaries to a number of papers published in the Philosophical Magazine and other journals; advantage was taken of the opportunity then afforded to collect these investigations together and to extend them. The time available for this purpose however proved to be too short for a full treatment of the whole subject; while Radiation was discussed pretty fully, the Mechanical Reactions had to be dismissed very briefly. During the interval which has elapsed since the award of the prize in 1909, the treatment of the latter part of the subject has been extended so as to complete the original program; I venture to hope that there has been sufficient improvement in the essay to justify the delay in publication which has arisen.
In order to avoid any great change in the form of the essay most of the additional matter has been introduced in seven Appendices, and the alterations in the original text have been confined to extensions of two problems already included in it, but somewhat scantily treated. The first problem deals with the motion of a ß-particle in a uniform electric field, Ch. XI, §§ 151 - 154, and the second with the electromagnetic field generated by this motion, Ch. V, §§ 43 - 60. Room has been made for the additional matter by slightly curtailing the treatment of two problems dealing with the field generated by a uniformly accelerated electric charge, Ch. V, §§ 25 - 42. These changes have been deemed advisable because the second problem admits of a simple solution in a finite form and thus affords an exceptionally good illustration of the method of the point potentials. All these additions to the text, as well as a few others of slight extent, have been enclosed in square brackets in order to distinguish them from the older portions of the essay.
In order to avoid misunderstandings it will be well to say a few words as to the scope and method of the present investigation.
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