[問題] 基本電學
[問題] 應考資格、各種國考疑難雜症等，以有正確作法、答案者為主
(不包括書裡的疑問)。若問題如人生規劃、讀書計畫等，無一
定作法、答案者，請用閒聊選項。
問題:http://ppt.cc/MGqM (第三題)
解題想法:
E=F/Q=F1/q1-F2/q2
=9*10^9*8*10^9/4-9*10^9*16*10^-9/4
(but false)
是否有大大能指點呢?
感激不盡
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