1.单选题- (共7题)
A． | B． |
C． | D． |
| A．放入超导环，磁铁的机械能转化成一部分电能，而电能不会转化为内能，能维持较大电流，从而对磁铁产生更大阻力，故超导环阻尼效果明显 |
| B．放入超导环，电能不能转化为内能，所以没有机械能与电能的转化，超导环不产生阻尼作用 |
| C．放入铁环，磁铁的机械能转化为电能，然后进一步转化为内能，磁铁的机械能能迅速地转化掉，具有阻尼效果 |
| D．放入铁环，磁铁的机械能转化为热能，损失掉了，能起阻尼作用 |
| A．0,0 | B．0，Babω | C． ，0 | D．Bab，Babω |
| A．从图示时刻起，线框产生的瞬时电动势为E=NBωSsinωt |
B．交流电流表的示数I= NBS |
C．R两端电压的有效值U= NBS |
D．一个周期内R的发热量Q= |
| A．交变电流的频率为100 Hz |
| B．原副线圈的匝数比n1∶n2＝10∶1 |
| C．电流表的读数I＝1.32 A |
| D．滑动变阻器的触头向右滑动，变压器的输入功率增大 |
| A．两交变电流的频率之比f甲：f乙=1：2 |
| B．两交变电流的电动势有效值之比E甲：E乙=3：1 |
| C．t=1s时，两线圈中的磁通量的变化率均为零 |
| D．t=1s时，两线圈均处在与中性面垂直的位置上 |
，通过一个理想电流表，接在一个理想的降压变压器两端。以下说法正确的是
| A．流过r的电流方向每秒钟变化50次 |
| B．变压器原线圈匝数小于副线圈匝数 |
| C．开关从断开到闭合时，电流表示数变小 |
| D．开关闭合前后，AB两端电功率可能相等 |
2.选择题- (共4题)
阅读理解
“Image is everything.” An entire industry has been built upon the concept that image is everything, but an appealing image isn't enough when there's no substance behind it.
First of all, one should consider how important image is in selling products and services. Advertising agencies have raised the art of creating an image to a state of near perfection. But if the product or service doesn't live up to it, customers will be very dissatisfied. The recent scandal (丑闻) about the Arthur Andersen accounting firm showed that behind that image, it had unfair business practices under the table. Despite the previous positive image, the firm is being accused of criminal actions. Although the image had been nearly perfect, the reality behind the image has led to its downfall.
Similarly, personal consultants(顾问) can build up a very positive public image for politicians and movie stars in the view of the general commons. But once again, history is filled with examples of both that fell from grace (体面) like the story of the Hollywood actor giving in to the pressures of fame and fortune. With people, just as with products and services, image is certainly important, but without positive substance behind it, failure is close.
To conclude, it's clear that an appealing image is extremely important to success, whether that image is related to selling a product or service or to the “selling” of a person. But image is only half of the equation(等式). What lies behind that image is every bit as important as the image itself — the person or product must live up to that image or there's little chance for long-term success.
阅读理解
“Image is everything.” An entire industry has been built upon the concept that image is everything, but an appealing image isn't enough when there's no substance behind it.
First of all, one should consider how important image is in selling products and services. Advertising agencies have raised the art of creating an image to a state of near perfection. But if the product or service doesn't live up to it, customers will be very dissatisfied. The recent scandal (丑闻) about the Arthur Andersen accounting firm showed that behind that image, it had unfair business practices under the table. Despite the previous positive image, the firm is being accused of criminal actions. Although the image had been nearly perfect, the reality behind the image has led to its downfall.
Similarly, personal consultants(顾问) can build up a very positive public image for politicians and movie stars in the view of the general commons. But once again, history is filled with examples of both that fell from grace (体面) like the story of the Hollywood actor giving in to the pressures of fame and fortune. With people, just as with products and services, image is certainly important, but without positive substance behind it, failure is close.
To conclude, it's clear that an appealing image is extremely important to success, whether that image is related to selling a product or service or to the “selling” of a person. But image is only half of the equation(等式). What lies behind that image is every bit as important as the image itself — the person or product must live up to that image or there's little chance for long-term success.
3.多选题- (共6题)
| A．金属棒ab中的感应电流方向为从a到b |
B．在t＝ 时间内，通过金属棒ab截面的电荷量为 |
| C．在t＝时间内，外力F的大小随时间均匀变化 |
| D．在t＝时间内，流过金属棒ab的电流大小保持不变 |
| A．方向向下并减小 |
| B．方向向下并增大 |
| C．方向向上并增大 |
| D．方向向上并减小 |
A． | B． | C． | D． |
A．输电线上的损耗电压为原来的 |
| B．输电线上的电流为原来的 |
| C．输电线上输送的功率为原来的 |
| D．输电线上损失的功率为原来的 |
| A．交变电流能够使电容器极板间的绝缘介质变成导体 |
| B．交变电流定向移动的电荷通过电容器两板间的绝缘介质 |
| C．交变电流能够使电容器交替进行充电、放电，电路中就有了电流，表现为交变电流“通过”了电容器 |
| D．交变电流通过了电容器，实际上自由电荷并没有“通过”电容器极板间的绝缘介质(击穿除外) |
(1)线圈产生的感应电动势的最大值.
(2)线圈在磁场中匀速转动的转速.
4.解答题- (共3题)
（1）在乙图中画出此时cd棒的受力示意图，并求出ab棒的速度；
（2）若ab棒无论从多高的位置释放，cd棒都不动，则ab棒质量应小于多少？
（3）假如cd棒与导轨间的动摩擦因数可以改变，则当动摩擦因数满足什么条件时，无论ab棒质量多大、从多高位置释放，cd棒始终不动？
（1）当线圈绕ab边转过60°时，线圈的磁通量以及此过程中磁通量的改变量为多少？
（2）当线圈绕dc边转过60°时，求线圈中的磁通量以及此过程中磁通量的改变量．
(1)在输电线路中设置的升、降压变压器原、副线圈的匝数比；
(2)用户得到的电功率是多少．
5.实验题- (共2题)
(1)在该实验中电流计G的作用是__________________________________________________．
(2)按实验要求，将下面的实物连成电路_____．
(3)在产生感应电流的回路中，器材中哪个相当于电源(填字母代号)_____
(1)某同学用一多用电表的同一欧姆挡先后测量了A、B线圈的电阻值，指针分别对应图乙中的a、b位置，由此可推断________线圈的匝数较多(选填“A”或“B”)．
(2)如果把它看成理想变压器，现要测定A线圈的匝数，提供的器材有：一根足够长的绝缘导线、一只多用电表和低压交流电源．请简要叙述实验的步骤(写出要测的物理量，并用字母表示)：_______________________________________________________________.
(3)A线圈的匝数为nA＝________(用所测物理量符号表示)．
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【1】题量占比
单选题:(7道)
选择题:(4道)
多选题:(6道)
解答题:(3道)
实验题:(2道)
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【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：2
5星难题：0
6星难题：10
7星难题：0
8星难题：5
9星难题：1