2018年高考物理一轮总复习实验专题实验九研究影响平行板电容器电容的因素课件鲁科版选修3_1.ppt

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2018年高考物理一轮总复习实验专题实验九研究影响平行板电容器电容的因素课件鲁科版选修3_1.ppt_第1页
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选修3-1: 9. 研究影响平行板电容器电容的因素,1.全程解读,2.考点考法,辅助阅读 课堂演示实验,一、考点精讲,1.全程解读,(1)实验过程 如图所示,用静电计测量已经充电的平行板电容器两极板间的电势差U。,(2)实验结论 平行板电容器的电容C与两极板的正对面积S成正比,与两极板间电介质的相对介电常数r成正比,与板间距d成反比。,二、典例剖析,2. 考点考法,考法 平行板电容器U不变时的考查,【例1】用控制变量法,可以研究影响平行板电容器电容的因素(如图)。设两极板正对面积为S,极板间的距离为d,静电计指针偏角为。实验中,两极板始终与电源相连,电压不变,则:,解析显隐,(1)保持d不变,减小S,则_。 (2)保持S不变,增大d,则电容器的电荷量Q_。(均填“增大”“减小”或“不变”),不变,减小,考法 平行板电容器Q不变时的考查,解析显隐,

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