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众所周知,当中性导体靠近一带电体时,必须发生静电感应现象。若将原中性导体接地,则该导体必然带有与施感电荷异号的电荷,而与导体接地位置无关。如
It is known that electrostatic induction must occur when a neutral conductor approaches an electrified body. If the original neutral conductor is grounded, the conductor must have a charge that is opposite to that of the inductive charge, regardless of the grounding position of the conductor. Such as