Re: [理工] [電磁]-雲科90-電資所

看板Grad-ProbAsk作者kagato (包)時間14年前 (2010/01/07 01:53)推噓6(6推 0噓 2→)

留言8則, 5人參與討論串2/2 (看更多)

※ 引述《aacvbn ( 姿勢+)》之銘言： : http://www.lib.yuntech.edu.tw/exam_new/90/el.pdf : 第14頁第2題有附圖@@ : The insulator between the inner conducting cylinder a and outer : cylindrical shell b is composed of four sectors of equal : dimensions but different dielectric constants, : ε_1 ε_2 ε_3 and ε_4 ,see Fig.2. The radius of cylinder a is (r_a) : and the inner radius of outer cylindrical shell b is (r_b). : In case the cylinders extend indefinitely , : find the capacitance per unit length. 令中央帶電+ρ_L , 外圍帶電-ρ_L 由Maxwell-equation ∫Dds = ρ_L → (D1+D2+D3+D4)*2πr/4 = ρ_L ε1E+ε2E+ε3E+ε4E = 2ρ_L/πr , E = 2ρ_L/[πr(ε1+ε2+ε3+ε4)] 2ρ_L*ln(b/a) V = ∫Edr = ____________________ [π(ε1+ε2+ε3+ε4)] π(ε1+ε2+ε3+ε4) C=ρ_L/V = _____________________ (F/m) 2ln(b/a) -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.171.102.115

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iyenn

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kagato

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iyenn

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