1 甲、乙、丙三个轻质小球 ,任意两个靠近均相互吸引 ,已知甲带正电 ,则乙球不可能 ;若丙球能吸引不带电的轻小物体 ,则乙球一定 .(填“带正电”、“带负电”或“不带电”) (2 0 0 1年山西省中考题 )图 12 物理学中规定电荷定向移动的方向为电流的方向 .若 1ｍｉｎ有 1 8Ｃ的 1 A, B, C three light balls, any two close to each other are attracted to each other, known to have a positive charge, then the B ball is impossible; if the ball can attract uncharged small objects, the B ball must (fill in “positively charged”, “negatively charged”, or “non-lived”) (in Shanxi Province in 2001) Figure 12 The direction in which directional charges move in physics is the direction of the current. If 1min has 1 8C