山西省忻州市第一中学高中物理第一章电场单元复习预习案(无答案)新人教版选修3_1.doc

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1电场【教学目标】1通过复习基础知识,整体把握本章内容形成知识框架。2通过和力学知识的综合应用,提高综合应用能力。【预习任务】一、电荷、电荷守恒定律和库仑定律:1起电方式:2电荷守恒定律:3库仑定律:(1)内容和公式:(2)适用条件:二、电场强度与电势的区别与联系:三、电场线:四、静电现象的应用:五、电容:六、带电粒子在电场中的运动:1基本思路:2基本方法:【自主检测】1图中虚线所示为静电场中的等势面 1、2、3、4,相邻的等势面之间的电势差相等,其中等势面 3 的电势为零一带正电的点电荷在静电力的作用下运动,经过 a、b 两点时的动能分别为 26eV 和 5eV当这一点电荷运动到某一位置,其电势能变为8eV,它的动能应为【 】1 2 3 4ba2A8eV B13ev C20eV D34eV2如图所示,一条长为 L 的绝缘细线,上端固定,下端系一质量为 m 的带电小球,将它置于电场强度为 E、方向水平向右的匀强电场中,当小球平衡时,悬线与竖直方向的夹角 =45。(1)小球带何种电荷?电荷量为多少?(2)若将小球向左拉至悬线呈水平位置,然后由静止释放小球,则放手后小球做什么运动?经多长时间达最低点?【组内检查】电场强度与电势的区别与联系O EE

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