本题目来源于试卷: Electric Charge and Electric Field，类别为 IB物理学
[问答题]
Figures 16–7 and 16–8 show how a charged rod p :(p3r,y*kw z5euyuojs 10jq tlaced near an uncharged metal o u9rq-atobk3(z *tey ; kd 87fpbject can attract (or repel) electrons. There are a great many electrons in the metal, yet only some of them move as shown. Why not all of them (k p9 3a;u ybz*orqft-kde87t?
参考答案:
For each atom in a
conductor, only a small number of its electrons are free to move. For example, every atom of copper has 29
electrons, but only 1 or 2 from each atom are free to move easily. Also, not even all of the free electrons
move. As electrons move toward a region,
causing an excess of negative charge, that region then exerts a large repulsive
force on other electrons, preventing them from all gathering in one place.
本题详细解析:
暂无
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