Re: [題目] 聽說是台大物理推甄試題
※ 引述《zizoids (阿G)》之銘言:
: 從gradute板看來的
: 7. 有一個電路如圖,所有電阻都是R(就是那些折線),求接上左邊兩個點點的等效電阻
: ●─^^^┬^^^┬^^^┬
: < < <
: > > > ....
: < < <
: ●─^^^┴^^^┴^^^┴
假設等效電阻為Req
●─^^^┬^^^┬^^^┬
< < <
→Req > > > ....
< < <
●─^^^┴^^^┴^^^┴
|<----Req----->|
R
●─^^^┬─┐
< <
→Req >R >Req
< <
●─^^^┴─┘
R
=> Req = 2R + R//Req
=> Req^2 - 2RReq - 2R^2 = 0
=> Req = (1+sqrt3)R
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