TAILIEUCHUNG - Electromagnetic Field Theory: A Problem Solving Approach Part 7

Electromagnetic Field Theory: A Problem Solving Approach Part 7. Electromagnetic field theory is often the least popular course in the electrical engineering curriculum. Heavy reliance on vector and integral calculus can obscure physical phenomena so that the student becomes bogged down in the mathematics and loses sight of the applications. This book instills problem solving confidence by teaching through the use of a large number of worked problems. To keep the subject exciting, many of these problems are based on physical processes, devices, and models. This text is an introductory treatment on the junior level for a two-semester electrical engineering. | The Curl and Stokes Theorem 35 as bA dl VxA e lim . i r 7 Ar-o r sin 0 Ar A AA--0 1 1 aAr a A r sin 0 d f dr . 19 The t component of the curl is found using contour c A-dl i rAelrdff i ATiedr Jc Js-as Jr r r - Ar A r_4 d0 An _4 dr 0 A-Ar _ Z f Ar Ag r 4r Af g r Ar r A0 20 as fA dl 1 a dA VxA lim -l- rA ---y 21 Ar- o r Ar A0 r dr 93 A0- O The curl of a vector in spherical coordinates is thus given from 17 19 and 21 as VxA 7 r A sin r sin 0 90 d 1 1 dAr 3 A . 1 a dAr 22 1-5-3 Stokes Theorem We now piece together many incremental line contours of the type used in Figures 1-19-1-21 to form a macroscopic surface S like those shown in Figure 1-23. Then each small contour generates a contribution to the circulation dC VxA -dS 23 so that the total circulation is obtained by the sum of all the small surface elements C VxA -dS Js 24 36 Review of Vector Analysis Figure 1-23 Many incremental line contours distributed over any surface have nonzero contribution to the circulation only along those parts of the surface on the boundary contour L. Each of the terms of 23 are equivalent to the line integral around each small contour. However all interior contours share common sides with adjacent contours but which are twice traversed in opposite directions yielding no net line integral contribution as illustrated in Figure 1-23. Only those contours with a side on the open boundary L have a nonzero contribution. The total result of adding the contributions for all the contours is Stokes theorem which converts the line integral over the bounding contour L of the outer edge to a surface integral over any area 5 bounded by the contour bA-dl VxA -dS L JS 25 Note that there are an infinite number of surfaces that are bounded by the same contour L. Stokes theorem of 25 is satisfied for all these surfaces. EXAMPLE 1-7 STOKES THEOREM Verify Stokes theorem of 25 for the circular bounding contour in the xy plane shown in Figure 1-24 with a vector The Curl and Stokes Theorem 37 z Figure .

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