a phy question

Saha · 發表於 2005-4-23 19:28:44

two insulated uncharged metal spheres X any Y are in contact with each other. a postively charged rod is brought near X without any contact while sphere X is earthed.
at steady state, which of the following description is/are correct?
1 shpere X gains electron
2 shpere Y loses electron
3 shpere X acquires a negative eletric potential.
4 shpere Y acquires a positive electric potential.
A1 only
B1 and 2only
C1and3only
D2and4only
E1,2,3,4
i wander y the answer is A.
X is negatively charged, but doesn't acquire a negative potential beacuse the system is steady?really confused

AI3 · 發表於 2005-4-23 20:26:22

我做果時都錯

MZN · 發表於 2005-4-23 20:35:29

Originally posted by Saha at 2005-4-23 07:28 PM:
two insulated uncharged metal spheres X any Y are in contact with each other. a postively charged rod is brought near X without any contact while sphere X is earthed.
at steady state, which of th ...

earthed??

yuren · 發表於 2005-4-23 21:00:08

Originally posted by Saha at 2005-4-23 19:28:
two insulated uncharged metal spheres X any Y are in contact with each other. a postively charged rod is brought near X without any contact while sphere X is earthed.
at steady state, which of th ...

岩岩做完

2076 · 發表於 2005-4-23 21:51:21

我想問acquire點解?

cmh_2002 · 發表於 2005-4-23 22:02:40

Originally posted by 2076 at 2005-4-23 09:51 PM:
我想問acquire點解?

獲得(v.)

麥旋風 · 發表於 2005-4-23 22:30:35

Originally posted by MZN at 2005-4-23 08:35 PM:

earthed??

Yes
Earth緊既野，Potential永遠都係0

MatthewChor · 發表於 2005-4-24 13:10:04

earth is only transfer away electons?

choy991044 · 發表於 2005-4-24 13:20:59

冇掂一年, 乜鬼都唔識了

麥旋風 · 發表於 2005-4-24 17:59:41

Originally posted by MatthewChor at 2005-4-24 01:10 PM:
earth is only transfer away electons?

想像一件物體同一個極大球體Earth share electrons

北倫敦之王 · 發表於 2005-4-25 09:12:28

Originally posted by 麥旋風 at 2005-4-24 17:59:

想像一件物體同一個極大球體Earth share electrons

想像佢係一個勁大的cap會好d(其實earth就係earth la

)

bobby_zamora · 發表於 2005-4-25 16:05:47

冇掂2年, 乜鬼都唔識...

麥旋風 · 發表於 2005-4-25 19:30:33

Originally posted by 北倫敦之王 at 2005-4-25 09:12 AM:

想像佢係一個勁大的cap會好d(其實earth就係earth la)

會考邊識cap呀

FlyingDonkey · 發表於 2005-4-25 19:53:12

earth 左 potential 一定係 0 ga la

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