capacitor again

2009-10-03 1:20 am
答案是A , 如何入手!?
沒有頭緒
圖片URL : http://cg-love.com/image.php?id=D757_4AC5C51A

圖片參考:http://cg-love.com/image.php?id=D757_4AC5C51A
更新1:

http://cg-love.com/image.php?id=D757_4AC5C51A

回答 (1)

2009-10-03 3:58 pm
✔ 最佳答案
After K is closed, C1 should be at the same potential as R1, C2 should be at the same potential as R2. (Because current flows along the resistors, not the capacitors.)

So, p.d. across C1 = 100/(100 + 200) X 12 = 4 V

p.d. across C2 = 12 - 4 = 8 V

Charge on C1 = C1V = (10)(4) = 40 uF

Charge on C2 = C2V = (20)(8) = 160 uF

參考: Physics king


收錄日期: 2021-04-19 15:27:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091002000051KK01044

檢視 Wayback Machine 備份