如图所示,用三根长度相同的绝缘细线将三个带电小球连接后悬挂在空中.三个带电小球质量相等,A球带正电,平衡时三根绝缘细线都是直的,但拉力都为零.则[AC]A.B球和C球都带负电荷B.B球带负
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![如图所示,用三根长度相同的绝缘细线将三个带电小球连接后悬挂在空中.三个带电小球质量相等,A球带正电,平衡时三根绝缘细线都是直的,但拉力都为零.则[AC]A.B球和C球都带负电荷B.B球带负](/uploads/image/z/6691065-33-5.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%A8%E4%B8%89%E6%A0%B9%E9%95%BF%E5%BA%A6%E7%9B%B8%E5%90%8C%E7%9A%84%E7%BB%9D%E7%BC%98%E7%BB%86%E7%BA%BF%E5%B0%86%E4%B8%89%E4%B8%AA%E5%B8%A6%E7%94%B5%E5%B0%8F%E7%90%83%E8%BF%9E%E6%8E%A5%E5%90%8E%E6%82%AC%E6%8C%82%E5%9C%A8%E7%A9%BA%E4%B8%AD.%E4%B8%89%E4%B8%AA%E5%B8%A6%E7%94%B5%E5%B0%8F%E7%90%83%E8%B4%A8%E9%87%8F%E7%9B%B8%E7%AD%89%2CA%E7%90%83%E5%B8%A6%E6%AD%A3%E7%94%B5%2C%E5%B9%B3%E8%A1%A1%E6%97%B6%E4%B8%89%E6%A0%B9%E7%BB%9D%E7%BC%98%E7%BB%86%E7%BA%BF%E9%83%BD%E6%98%AF%E7%9B%B4%E7%9A%84%2C%E4%BD%86%E6%8B%89%E5%8A%9B%E9%83%BD%E4%B8%BA%E9%9B%B6.%E5%88%99%5BAC%5DA%EF%BC%8EB%E7%90%83%E5%92%8CC%E7%90%83%E9%83%BD%E5%B8%A6%E8%B4%9F%E7%94%B5%E8%8D%B7B%EF%BC%8EB%E7%90%83%E5%B8%A6%E8%B4%9F)
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