多电荷的平衡问题,是静电场中的典型问题.由于此类题目涉及的内容为库仑定律及力的平衡条件,故属《静电场》一章中必须掌握的内容之一.例题两个带电小球,电荷量分别为q_1=+9Q和q_2=+Q,在真空中相距L=0.4 m.如果引入第三个带电小球q_3,恰好使三个小球都处于平衡状态,则第三个小球应该放置在什么位置?第三个小球带何 The issue of the balance of multiple charges is a typical problem in electrostatic fields, and because such topics deal with Coulomb’s law and force balance conditions, it is one of the things that must be covered in the chapter “Electrostatic Field.” Example Two charged The charge of the sphere is q_1 = + 9Q and q_2 = + Q, respectively, and in a vacuum it is L = 0.4 m. If the third charged sphere q_3 is introduced, just enough for the three small particles to be in balance, the third Where should a small ball be placed?