Question

一道初二物理题

Two metal spheres, A and B, on insulating stands are charged, A positively and B negatively. The two spheres are now connected electrically through the sensitive centre-zero galvanometer G by touching the bared ends of the insulated wires, one to each sphere, as shown in the diagram below.
a. Describe what is observed on the centre-zero galvanometer.
b. Explain your observations.
翻译大致如下：
如图，两金属球AB分别在绝缘的台子上，A带正电，B带负电，检流计连接着这两个球。
问题A：检流计上显示什么
问题B：为什么会这么显示

Answer 1

1，检流计显示有“由A向B”方向的电流。
2，回答道理，就初中水平“是因为电荷发生定向移动”！【在检流计上，是负电荷发生由B向A的定向移动。物理学规定：正电荷定向移动的方向为电流方向。因而电流方向与负电荷定向移动的方向相反。】