处在外界静电场中的导体,在静电平衡时,感应电荷如何分布?当导体接地时,感应电荷又如何分布?不少物理书刊上常采用图1(a)、(b)来说明. 这两幅插图表明:导体B不接触时,左右两端都有等量异种感应电荷,而一旦接地,右端感应电荷消失(转移到地球),但左端感应电荷似乎不变. When the conductors are grounded, how can the induced charge be distributed? This is often illustrated in Figure 1(a) and (b) in many physical publications. The two illustrations show that when conductor B is not in contact, there is an equal amount of alien inductive charges on both the left and right sides, and once grounded, the right-end induced charge disappears (transfers to Earth), but the left-end induced charge does not seem to change.