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人教版九年义务教育三年制初级中学《物理》教科书第47页“大问号”中这样说道:“取两个相同的验电器 A 和 B,使 A 带电,B 不带电,(图4-5甲),用金属棒把 A 和 B 连接起来,可以看到 A 的金属箔张开的角度减小,B的金属箔张开,最后两个验电器金属箔张开角度相同(图4-5乙),这表明验电器 B 也带了电,有电荷通过金属棒从 A 流到 B,也就是说用金属棒把 A 和 B 连接起来时,金属棒上有了电流,但这种电流是短暂的,不是持续的.”
In the nine-year compulsory education three-year primary school middle school “Physics” textbook, the 47th “big question mark” states: “Take two identical electroscopes A and B so that A is charged and B is not charged. (Fig. 4-5A). Using metal rods to connect A and B, one can see that the angle at which A’s metal foil expands is reduced, the metal foil at B opens, and the last two electroscope foils have the same open angle. (Fig. 4-5B) This shows that the electroscope B is also charged. There is a charge flowing from A to B through the metal rod. That is to say, when A and B are connected by a metal rod, current flows on the metal rod. But this current is short-lived, not continuous."