题目列表(包括答案和解析)
5、如图所示电路中,L是并联在电阻R2上的一段电阻忽略不计的导线,电路两端A、B间的电压U恒定,电键S闭合。那么应认为( )
A、通过电阻R1和R2的电流相等
B、通过电阻R1和导线L的电流相等
C、R1两端电压小于电路两端电压U
D、如果断开电键S,R1两端电压将增大
4、如图所示是一种测定导电液体深度的装置:包着一层电介质的金属棒与导电液体形成一个电容器,电容量的变化能反映液面的升降情况 ( )
A、电容增大反映h增大
B、电容增大反映h减小
C、将金属棒和导电液体分别接电源两极再断开后,液体深度变化时导电液与金属棒间的电压增大反映h减小
D、将金属棒和导电液体分别接电源两极再断开后,液体深度变化时导电液与金属棒间的电压增大反映h增大
3、如图所示为某一点电荷Q产生的电场中的一条电场线,A、B为电场线上的两点,一电子以某一速度沿电场线由A运动到B的过程中,动能增加,则可以判断( )
A、电场线方向由B指向A B、场强大小EA>EB
C、若Q为负电荷,则Q在B点右侧 D、Q不可能为正电荷
2、一台家用电冰箱的铭牌上标有“220V 100W”,这表明所用交变电压的 ( )
A、峰值是380V B、峰值是220V C、有效值是220V D、有效值是311V
1、电磁感应现象揭示了电和磁之间的内在联系,根据这一发现,发明了许多电器设备。下列电器设备中,哪个没有利用电磁感应原理( )
A、动圈式话筒 B、白炽灯泡 C、磁带录音机 D、日光灯镇流器
50、如图12所示,将一线圈放在一匀强磁场中,线圈平面平行于磁感线,则线圈中有感应
电流产生的是
A、当线圈绕N边转动
B、当线圈绕M边转动
C、当线圈做垂直于磁感线的平行运动
D、当线圈做平行于磁感线的运动 图12
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49、关于安培力和洛伦兹力,如下说法中正确的是
A、带电粒子在磁场中运动时,一定受到洛伦兹力作用
B、放置在磁场中的通电导线,一定受到安培力作用 图11
C、因洛伦兹力总垂直于电荷运动方向,故洛伦兹力对运动电荷一定不做功
D、因安培力垂直通电导线,故安培力对通电导线一定不做功
48、如图11,一根有质量的金属棒MN,两端用细软导线连接后
悬挂于a、b两点、棒的中部处于方向垂直纸面向里的匀强磁
场中,棒中通有电流,方向从M流向N,此时悬线上有拉力、
为了使拉力等于零,可
A、适当减小磁感应强度 B、使磁场反向
C、适当增大电流强度 D、使电流反向
47、如图10所示,绕在铁芯上的线圈与电源、滑动变阻器和电键组成闭合回路,在铁芯的
右端套有一个表面绝缘的铜环A,下列各种情况中铜环A中没有感应电流的是
A、线圈中通以恒定的电流
B、通电时,使变阻器的滑片P作匀速移动
C、通电时,使变阻器的滑片P作加速移动
D、将电键突然断开的瞬间
46、关于产生感应电流的条件,下述说法正确的是
A、位于磁场中的闭合线圈,一定能产生感应电流;
B、闭合线圈和磁场发生相对运动,一定能产生感应电流;
C、闭合线圈作切割磁感线运动,一定能产生感应电流;
D、穿过闭合线圈的磁感线条数发生变化,一定能产生感应电流、
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