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By Harry F. Tiersten

This tract is predicated on lecture notes for a path in mechanics that has been provided at Rensselaer Polytechnic Institute off and on for the prior 20 years. The path is meant to supply graduate scholars in mechanics with an realizing of electromagnetism and get ready them for stories at the interplay of the electrical and magnetic fields with deformable good continua. As such, it really is principal that the excellence among particle and continuum descriptions of topic be conscientiously made and that the excellence among that that's inherently linear and that that's intrinsically nonlinear be sincerely delineated. each attainable attempt has been made on my half to accomplish those ends. I desire to recognize the contributions of a few scholars and school who attended the lectures through the years and who, by way of their questions and recommendations, considerably more desirable a number of the sections. This preface wouldn't be whole if i didn't indicate that my curiosity in electromagnetism used to be initiated and my perspective in the direction of the improvement of the equations was once stimulated by means of lectures given by means of the past due Professor R.D. Mindlin at Columbia college within the overdue nineteen fifties. i need to thank Professor C. Truesdell for his invaluable feedback, which i believe considerably more desirable the readability and clarity of the creation, and Dr. M.G. Ancona for his remark about the readability of an enormous aspect in Sec. 1.1.

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4. Linearized Electrostatics Interchanging the order of integration, we obtain f S n'EdS= i v0 (p-VQ·P) f n'r -fdSdV+ sri f (a+n'P) So f 27 n'r -fdSdSo. 4) since, as shown in Sec. 3, for a closed surface S, the solid angle for any point outside S vanishes and for any point inside is 4n, and all of So and Vo - V are outside S. 5) for any volume V, and in particular an arbitrary differential element of volume. 6) as the differential equation of electrostatics valid for insulators and conductors alike.

12) shows that the law of action and reaction is satisfied for the two complete circuits. 12) reveals that for that expression the law of action and reaction is satisfied differential element by differential element. 1). However, the differential form is required to obtain the field theory. 17) and eventually when the currents are not steady in closed loops. The fact that this form does not satisfy the law of action and reaction by itself does not deter us because, as we have seen, in the case of steady currents, which must flow in closed loops, the resultant forces between entire circuits does satisfy the law of action and reaction and in the nonsteady case we have time varying magnetic (and electric fields) and as we shall see later in electromagnetism the electromagnetic field carries linear momentum (even in free space).

15) CP '1 in which we have defined the s coordinate as the distance from s~ along the curve of the P circuit and we have replaced d'l by ds since they are identical. 15) in the form dC = _1. 16) since FR and FS are single-valued. 11) due to any given element ds Q of the Q circuit acting on the entire P circuit vanishes as well as the force. 2. 16), Eq. 12) shows that the law of action and reaction is satisfied for the two complete circuits. 12) reveals that for that expression the law of action and reaction is satisfied differential element by differential element.

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