A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左侧靠近小球.A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左

A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左侧靠近小球.A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左
A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左侧靠近小球.
A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左侧靠近小球A,为能得到带负电的小球,以下做法中正确的是（ ）
A.先移开C球,再取出A球就是带负电的小球
B.先移开C球,再取出B球就是带负电的小球
C.先取出A球,再移开C球,A球就是带负电的小球
D.先取出B球,再移开C球,B球就是带负电的小球
麻烦说下原因谢谢!

A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左侧靠近小球.A,B两个有绝缘支架的金属球左右放置且互相接触（A在左,B在右）,现将带正电的小球C从左
因为A B两球相互接触,把带正电的c球从左变靠近A球的时候由于正负电荷相互吸引A B两球会发生电子的转移导致A球带负电B球带正电.基本上是这样子的,要注意理解.

For everyone who wants to buy genuine Jordans shoes at inexpensive prices there's something you should know. First you need to make certain the sneakers you will get are real. Everybody is frightened ...

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For everyone who wants to buy genuine Jordans shoes at inexpensive prices there's something you should know. First you need to make certain the sneakers you will get are real. Everybody is frightened to purchase designer items online believing that they will be involved with a gimmick and in reality end up getting a piece of junk of the original. You also ought to know that when you purchase Air Jordan footwear at excessive costs perhaps this can be a scam? Are the large companies who guarantee 100% not ripoff footwear really ripping us off? One of the fundamental details you need to know is that you will discover by investing in Jordans footwear,Discount Air Jordan Shoes, ALL of them are manufactured outside of the United States. There is NO genuine manufacturing plant inside the United states of america and any store saying they are promoting genuine USA made Jordans footwear is actually selling a piece of junk and if you get from your company saying this they will in fact scamming YOU. Alongside using the fact that no Nike air jordan footwear is produced in the united states,Men's Air Jordan 5, the expenses to truly manufacture choices really low and the fact that these shoes can be sold for US$500 or even more is at itself another rip-off. If the footwear is all produced in Japan for pennies however sold to us, the consumers, in a mark up more than three to four hundred percent or more, then are we not once more getting involved in an additional scam? Is it not useless in itself to fabricate some thing for say US$15 (or less) and then sell it to us for US$500 or even more? The economy all over the world is not within the very best shape however we don assault these big businesses to play honest preventing their ripoffs. It's little wonder a few of these designer clothes companies return this kind of huge profits every year. Perhaps we should be worrying a little more about the ripoffs these so called absolute genuine retailers take part in after they sell us products with your huge mark up costs. They assure you are not finding a knockoff however when the same manufacturer produces the very same footwear to a new wholesaler who then sells them for any fraction with the cost that is the scammer precisely? An additional essential fact is that numerous from the unscrupulous firms that market knockoff Nike air jordan footwear is not running a business for too long. The rip-off they're operating is rapidly found and they're busted for selling knockoff goods. If you work with a site which has been about for a time to purchase your low cost genuine Air Jordan footwear you might be similar to to obtain genuine shoes compared to the knockoff items that will be available from some fly-by-night online scammers. There are internet sites similar to this and they'll deliberately setup their business like a scam to ripoff their clients so be sure you do some research to the company before sending them any of your wages.
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选C。A球B球相接触，C球靠近，C球带正电，AB球中电子向靠近C球的A端移动，这样A球带负电，B球带正电，现在分开AB两球，则A球里的电子没处可去，就得到带负电的A球了。