题目列表(包括答案和解析)
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
请用铅笔将选择题的答案在答题卡(学校提供或用下表)上涂上横线、
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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、
45、如图9所示,在探究电磁感应现象时
得出如下结论,其中正确的是:
A、开关接通,滑片P不动,电流表偏转
B、开关接通,滑片P移动,电流表不偏转
C、当闭合电路大螺线管中磁通量变化时,产生了电流
D、以上结论都正确
44、下列说法中正确的是
A、交流电的频率越高,电感器对电流的阻碍越明显
B、电感器对交流电没有阻碍
C、直流电不能通过电感器
D、以上说法都不对、
43、下列说法中正确的是
A、直流电能通过电容器
B、交流电不能通过电容器
C、直流电、交流电都能通过电容器
D、交流电的频率越低,电流通过电容器的能力也越低
42、普通家庭在家用电器的选购上,基本上要考虑以下的原则
①选购产品的功能
②与家居适应的技术参数、外形结构、产品质量和售后服务以及品牌
③选购产品越先进越好,价格越昂贵越好,设计越时尚越好
④为了环保,冰箱应选无氟电冰箱,照明用具尽量选用发光效率高的节能光源
A、①② B、②④ C、②③④ D、①②④
41、下面关于各种电器应用的电磁学原理的说法中,错误的是
A、电视机的显像管应用了磁场使电子束偏转的原理
B、变压器应用了电磁感应现象
C、微波炉是用电热棒加热食物的
D、电磁灶是利用电磁感应原理制成的
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