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# ex2f10 - ECE573 EXAM#2 FALL 2010 Instructions 1 Closed-book...

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ECE573 EXAM #2 FALL 2010 Instructions : 1. Closed-book, closed-notes, open-mind exam. 2. Work each problem on the exam booklet in the space provided. 3. Write neatly and clearly for partial credit. Cross out any material you do not want graded. Name : Problem 1 : /20 Problem 2 : /20 Problem 3 : /20 Problem 4 : /40 Total : /100 Infinitely-Long Wire Carrying a Current i (A) or Charge q (C/m) : B = µ o H = µ o i 2 πx E = q 2 πϵ o x Transmission Line Parameters : R = ρ l A R 2 R 1 = T 2 + T T 1 + T L = 2 × 10 7 ln GMD GMR’ H/m C = 2 πϵ o ln GMD / GMR F/m r = re 1 / 4 = 0 . 7788 r ϵ o = 8 . 854 × 10 12 F/m µ o = 4 π × 10 7 H/m 1 mi = 1609 m 1 ft = 12 in 1 in = 2 . 54 cm 1

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Problem 1 (20 Points) A B d D d d C q/3 q/3 q/3 a1 a2 a3 Consider a bundle of three solid conductors as shown above. Each conductor has radius r and each carries a uniform charge density (q/3) (C/m). The conductors are placed at the summits of an equilateral triangle with sides equal to d (m).
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ex2f10 - ECE573 EXAM#2 FALL 2010 Instructions 1 Closed-book...

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