By Julius Adams Stratton
ISBN-10: 0470131535
ISBN-13: 9780470131534
This publication is an electromagnetics vintage. initially released in 1941, it's been utilized by many generations of scholars, lecturers, and researchers ever due to the fact that. because it is vintage electromagnetics, each bankruptcy remains to be referenced to this day.This vintage reissue includes the complete, unique version first released in 1941. also, new forewords via Dr. Paul E. grey (former MIT President and colleague of Dr. Stratton) and one other via Dr. Donald G. Dudley, Editor of the IEEE Press sequence on E/M Waves at the importance of the book's contribution to the sphere of Electromagnetics.
Read Online or Download Electromagnetic Theory (IEEE Press Series on Electromagnetic Wave Theory) PDF
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Extra resources for Electromagnetic Theory (IEEE Press Series on Electromagnetic Wave Theory)
Example text
All substances exhibit conductivity to some degree but the range of observed values of u is tremendous. The conductivity of copper, for example, is some lo7 times as great as that of such a “good” conductor as sea water, and 1019 times that of ordinary glass. I n Appendix 111 will be found a n abbreviated table of the conductivities of representative materials. Equation (13) is simply Ohm’s law. Let us imagine, for example, a stationary distribution of current throughout the volume of any conducting medium.
Ilda (11) webers, and the intensity of the field B, or flux density, may therefore be expressed in webers per square meter. ) between t,he points a and b; although its value in a nonstationary field depends on the path of integration. f. around any closed contour C is, therefore, equal to the rate of decrease of flux threading that contour, so that between the units there exists the relation 1 volt = weber 1 ---1 second or 1 weber = 1 joule ampere = 1 kilogram . meter2 -. coulomb . second It is important to note that the product of current and magnetic flux is an energy.
I n the limit, as A1 --to, the cnds of the cylinder lie just on either side of S and the contribution from the walls becomes vanishingly small. --For the normal boundary condition. the corresponding value of B just across the surface in (2) will be denoted b y Bz. We shall also indicate the positive normal t o S by a unit vector n drawn from (1) into (2). According t o this convention medium (1) lies on the negative side of S , medium (2) on the positive side, and nl = -n. Then as A1 + 0, Aa 3 0, - (Bz- B,) n (3) = 0; the transition of the normal component of B across a n y surface of discontinuity in the medium i s continuous.