[題目] 電磁學~

[LoveYoung (Jacqueline)]

[領域]   電磁學

[來源]   考古題

[題目]   1.

         A parallel-plate capacitor is filled with a dielectric with

         power factor PF = 0.004 and ε=14*ε0. The plates are 350 mm

         square and the distance between them 12 mm. If 300V (rms) at

         3MHz is applied to the capacitor , find the power dissipated

         as heat?

         2.

         有個有小疑問?

         Jtotal (全部的電流密度)

         = σE (real current density) + (dD/dt) (displacement curent)

         = σE + jwεE

         我想問一下如果E是一個sin函數

         這樣的話dD/dt就會是cos函數

         如此一來第二個等號就不會成立了是嗎?




[瓶頸]                             (寫寫自己的想法，方便大家為你解答)


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推 cashkaop:回2.  換成Sin(X+1/2拍)