ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.电荷 导体和绝缘体一.电荷1、电现象:摩擦起电2、摩擦起电的本质:_______________3、电荷的分类⑴ 正电荷: ___________摩擦过的 __________带的电荷,质子、阳离子(Na+)都是正电荷⑵ 负电荷:__________摩擦过的__________带的电荷,电子、阴离子(Cl-)、阴离子团(OH-)都是负电荷4.电荷间的相互作用同种电荷相互________、异种电荷相互__________5、验电器,利用了什么原理?例题 1物理老师在讲授“摩擦起电”一节时,请同学们用塑料直尺在头发上摩擦几下后试试能否吸引碎纸片,结果塑料直尺能够吸引碎纸片.假如以橡胶棒与毛皮摩擦作类比,这个现象说明 ( )A.摩擦时,同时发生了正、负电荷的转移,头发带负电,塑料直尺带正电B.摩擦时,同时发生了正、负电荷的转移,头发带正电,塑料直尺带负电C.摩擦时,只发生了正电荷的转移,使塑料直尺带了正电D.摩擦时,头发上的电子向塑料直尺转移,使塑料直尺带了负电例题 2三只轻轻质小球分别用丝线悬挂着,其中任意两只球靠近时都互相吸引,则下面结论正确的是 ( )A.三球都带电B.有两球带同种电荷,第三球不带电C. 只有一球带电D.有两球带异种电荷,第三球不带电6、电(荷)量物理意义: 符号: 单位: 7、元电荷一个电子的电量:e= 8、电中和打雷时,天上的电荷移动到了地面,地球存在亿万年了,为什么地球没有变成电球?Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students), and promote the formation of good school spirit with the influence of the league members. All League branches should start with r...