精華區beta Grad-ProbAsk 關於我們 聯絡資訊
Two perfect dielectrics have relative permittivities ε1=2 and ε2=8. The planar interface between them is the surface x - y + 2z = 5. The origin lies in region 1. If E1 = 100ax + 200 ay -50 az V/m, find E2. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.141.5.123
jovibon:把平面的法向量解出來 就差不多了阿 提示個了吧 03/21 23:30
braceup:感謝你~但小弟資質較差~可以在多指示點嗎~ 03/22 00:26
mttsaimark:觀念:切向電場連續,法向電通連續 03/22 00:52
mttsaimark:令E1=E1t+(ax-ay+2az)E1n 03/22 00:53
mttsaimark:D1n=D2n 03/22 01:07
mttsaimark:so 100-200+(-2*50)=4En---->En=-50 03/22 01:20
mttsaimark:E1t=100ax+200ay-50az+50*(ax-ay+2az) 03/22 01:35
mttsaimark:E1t=150ax+150ay+50az 03/22 01:39
mttsaimark:又 D=εE,E2n=(2/8)*(-50*(ax-ay+2az)) 03/22 01:42
mttsaimark:E1t=E2t,E2=E2n+E2t,即為所求,不知是否解決你的問題 03/22 01:45
mttsaimark:這是好題目,你發問時我才去研究的,本來我也不會 03/22 01:54
mttsaimark:住你考上國立研究所,願主祝福你! 03/22 01:56
braceup:M大我真是對你有說不盡的感謝阿~ 03/22 02:25