一、问题的提出 例1如图1所示,两个可以自由移动的点电荷已分别放在左右两侧,左侧点一万电荷带正电Ql,右侧点电荷带负电Q:,且Q‘「-4Q,,另取一个可以自由移动的点电荷放在弘和Q:的连线上,若要使整个系统平衡,应(). (A)放负电荷于Q:的左侧 (B)放负电荷于Q:的右侧 (C)放正电荷于Q First, the problem of the proposed example 1 shown in Figure 1, the two point charges can be moved freely on the left and right sides, the left point of 10,000 charge with positive charge Ql, the right point charge with negative charge Q:, and Q’ "-4Q, another point charge that can be moved freely is placed on the connection of Hirokazu’s Q:. To balance the entire system, it should be (). (A) Place a negative charge on the left side of Q: ( B) Place a negative charge on the right side of Q: (C) Place a positive charge on Q