First,we can assume that rod's charge before the contract is Q,and after the contract,because the pith ball is electric neutrally,the Q electric quantity would balanced divide,both rod and pith ball would obtain 1/2Q electric quantity.So the rod's charge before and after the contact had the same sign.
In this question,the essence is the pith ball is neutral,so there is not added charged in this system.Therefore,the sign of the charge would not change.
SAT2物理上面的一道題
SAT2物理上面的一道題
An electrically charged,insulated metal rod is observed to attract a neutral pith ball and,after contact is made,to repel the ball,which of the folling sentence could be true.
the rod's charge before and after the contact had the same sign
為什么是這個(gè)
An electrically charged,insulated metal rod is observed to attract a neutral pith ball and,after contact is made,to repel the ball,which of the folling sentence could be true.
the rod's charge before and after the contact had the same sign
為什么是這個(gè)
英語人氣：627 ℃時(shí)間：2020-06-20 14:54:07
優(yōu)質(zhì)解答
我來回答
類似推薦
- 陳蕃的“蕃”在這里的讀音是什么?
- But the one million people of the city,who thought little of these events,were asleep as usual that
- 線粒體的氧化磷酸化和葉綠體的光合磷酸化有什么共同點(diǎn)和不同點(diǎn)?
- 一個(gè)含30度角的直角三角形能否分割成2個(gè)全等的三角形
- 設(shè)f(x)=√x,g(x)=-x+a(a＞0,a∈R),若不等式▏{f(x)+a[g(x)-2a]}/f(x)▕ ≤1對(duì)x∈[1,4]恒成立,求a的取值范圍.小弟拜謝!
- 熱帶魚最適合的溫度是幾度?
- 有關(guān)圓周率的知識(shí)
- f(x)=|x²+3x|,關(guān)于x的方程f（x）-a|x-1|=0恰有4個(gè)互異的實(shí)根,則a的取值范圍
- 在下列敘述中,能說明鹽酸是強(qiáng)酸,醋酸是弱酸的是( )
- 六十天打一字 江水流打一字 加一半,減一半打一字 上不在上,下不在下打一字 七十二小時(shí)打一字
- 如果黃瓜和西紅柿平均每平方米的產(chǎn)量都是8kg,那么黃瓜和西紅柿一共能產(chǎn)多少kg
- 求圖元計(jì)算公式軟件,解決幾何圖形面積、體積、周長等
猜你喜歡
- 1用120個(gè)邊長是1cm的正方形,可以擺出 種面積是120平方厘米的長方形.
- 2m為何值時(shí)，方程組y＝x+my2?4x?2y+1＝0 （1）有兩組不相等的實(shí)數(shù)解； （2）有相同的兩組實(shí)數(shù)解； （3）無實(shí)數(shù)解．
- 3初一語文(下)主要復(fù)習(xí)什么?
- 4腦筋急轉(zhuǎn)彎：.How can you make a rope shorter without cutting or winding it?
- 5一根跳繩長五分之四米,這根跳繩的四分之三有多長?怎么算?
- 6人們?cè)诖笞匀恢惺艿竭^哪些啟發(fā),有什么發(fā)明創(chuàng)造
- 7為什么before后面加being given而不是giving
- 8不要把污水直接排入河流英文怎么說
- 9兩個(gè)同體積的容器一個(gè)裝HCl氣體另一裝H2和CL2的混合氣體同溫同壓下,一定相同的是.
- 10五星村共有小麥的320公頃,玉米地比小麥地多1/4,這個(gè)村的玉米地比小麥地多多少公頃?玉米地有多少公頃?
- 11老外口中的的she average是什么意思
- 12大什么大什么,要成語的.