By Harry F. Tiersten

This tract relies on lecture notes for a path in mechanics that has been provided at Rensselaer Polytechnic Institute off and on for the prior two decades. The direction is meant to supply graduate scholars in mechanics with an realizing of electromagnetism and get ready them for reviews at the interplay of the electrical and magnetic fields with deformable sturdy continua. As such, it's crucial that the excellence among particle and continuum descriptions of subject be rigorously made and that the excellence among that that is inherently linear and that that is intrinsically nonlinear be truly 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, through their questions and proposals, considerably more advantageous many of the sections. This preface wouldn't be entire if i didn't indicate that my curiosity in electromagnetism used to be initiated and my angle in the direction of the improvement of the equations used to be encouraged by way of lectures given through the overdue Professor R.D. Mindlin at Columbia collage within the overdue nineteen fifties. i need to thank Professor C. Truesdell for his worthwhile feedback, which i believe considerably better the readability and clarity of the creation, and Dr. M.G. Ancona for his remark in regards to the readability of an immense element in Sec. 1.1.

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8) dF(PQ) #- - dF(QP). However, when the total force F P is determined by integrating over both complete current loops, we find that the law of action and reaction is satisfied for the interaction of the two complete circuits. 1) and integrating over both current loops to obtain F(PQ)= IPI Qf. f. 13) which says that the resultant force acting between the two complete circuits is equal and opposite. 11), the forces due to the individual elements of circuit P can still result in a couple. However, since the resultant force vanishes, the moment of the force system due to an element of the Q circuit on the entire P circuit about any 52 6.

12). However, as we already know, the field vectors may not be continuous at material surfaces of discontinuity, and at such places TE must be used. Thus, it is quite clear that the expression for TE will be very important in its effect on the mechanical boundary conditions at surfaces of discontinuity. 16 At this point it is purposeful to note that if an electric field E exists at points of free-space, the associated Maxwell electrostatic stress tensor TE exists. Both fields exist at the point in question independent of the location and values of the sources which generated E, which may not even be known.

Now, let us determine the expression for the energy when we have a dielectric cavity in a metal, wher~ the cavity has distributed charge density p and polarization P. This is the general case because putting the metal outside the dielectric produces surface charge (j on the metal-dielectric interface and at the same time eliminates consideration of any fields outside the dielectric, which gives us the simplest general problem we can consider. Thus, we consider the configuration shown in Figure 19.

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