3、选择题  关于基元电荷，正确的说法是
A.基元电荷是自然界中电荷的最小单元
B.基元电荷就是点电荷
C.基元电荷就是质子
D.1C电量叫基元电荷

4、选择题  平行闭合线圈的匝数为n，所围面积为S，总电阻为R，在△t时间内穿过每匝线圈的磁通量变化为△Φ，则通过导线某一截面的电荷量为（　　）
A.style="shiti/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACEAAAArCAIAAAB5HXZeAAAAmUlEQVRYhe3VSQ6AIAwF0H//S9c来源:91考试网 91eXAm.orgF0QSBTrZiYv/KCPgYBZQflFFGe4tIe5PRAA2DM4mGtitMG749+sQbV9H4IBhjvWnLVT9WzLvGsgbL2ObKZJBjzcUt5CjqDOjCDEU2slOGwcjIjnGUEWuIBz7AIMv96DRuH003HNNlXg/T17UGFDddmOFmPmBMfnCx52O6zln76mHK+J9xADCbKqkeOxxCAAAAAElFTkSuQmCC" alt="">
B.style="shiti/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB0AAAApCAIAAABGGrXjAAAArklEQVRIie3UORKAIAwF0Nz/0lg4yvbJAgEtksJR0UcIC6U9QeHyLtFSl2fdG9XQ9ISzO/oMvSq+42mqw8d9m/ob4IJKwWEO+s59nHBHo+ZpuQ4mNynnTZx6U1MegiaYlLHrHuFmVzlpttiYb7jTbjM9PvuN6oMR7+9Ft3/k3DcLuBw1q1M4/cor7NjmNtyIYGihDv3PyprIibi5PVrm3lR23oWKeGz9bB+H+7F7AU6YRWShtfeyAAAAAElFTkSuQmCC" alt="">R
C.style="shiti/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAApCAIAAAAj90ecAAAA2UlEQVRYhe2W4Q6AIAiEef+Xph+tVoLc0TRzeb9aQHzaMRUdLRkNMC+BSDP0OQn29gyEHBpGwKSlCa5fBIu7CxOceXENSXCG7EOVQO/b6xbYlzANEpfhGLk7QbY9k5z4Cxg2Q6BZJ9r2RQ20/YNQRGDbM3LbxxugOu/JtAh6EJBeayWHYKAmIYgH+gcEkrkRXatq1utC4EYFHXUUAfsVdG/oS+BPeXjUsQRwZXEmY4I2BEEa49/0zYLBIt3zbQJ+9uys8u6pEqTOt8Jrtbl4Po0vaBEsgkWwawN/9ki16hvXtAAAAABJRU5ErkJggg==" alt="">
D.style="shiti/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAoCAIAAAAHaf8HAAAAx0lEQVRYhe3WyxKAIAgFUP7/p2lRU6ZwwwcyTrIqCw8VOhGHBq3EEw0u14und2jpFfyZbKlAYJIifHmZ6eTTZFCBZmtX3XmcaOLxpGAcn/rylqyWNgbj4DPP4Bk0eUPn42VmX2NqrXh2S4gMuEcg0gRQ0PB4NjL7njqSz9QAPsrm++lL3th3zXEpmR3QeunjzrT5c9vZ/OcUUk/N49n8M+LCk7LtB/C173/wt6/O7bezgxi+rYKV+dKbt+7Fdgvo/J7Y/Ob/yR98eNQbd2e0xgAAAABJRU5ErkJggg==" alt="">

5、选择题  如图所示电路中，C2=2C1，R1=2R2，下列说法正确的是：

A．开关处于断开状态，电容C2的电量大于电容C1的电量
B．开关处于断开状态，电容C1的电量大于电容C2的电量
C．开关处于接通状态，电容C2的电量大于电容C1的电量
D．开关处于接通状态，电容C1的电量大于电容C2的电量