1.单选题- (共6题)
角，由于缓慢漏电使A、B两质点的带电量逐渐减小。在电荷漏完之前悬线对悬点P的拉力大小（）
A. 保持不变 B. 先变大后变小 C. 逐渐减小 D. 逐渐增大
| A．物体的末动量一定是负值 |
| B．物体的动量一定减少 |
| C．物体的动量改变量的方向一定与规定的正方向相反 |
| D．物体原来的动量方向一定与这个冲量的方向相反 |
B. 
C. 
D. 
A. 先加速运动，后减速运动 B. 先减速运动，后加速运动
C. 受的电场力不做功 D. 受的电场力的冲量为零
| A．点电荷是一种理想化的物理模型 |
| B．点电荷所带电荷量不一定是元电荷电荷量的整数倍 |
| C．点电荷所带电荷量一定很小 |
| D．点电荷、元电荷、检验电荷是同一种物理模型 |
A. q1、q2都是正电荷，且q1＞q2
B. q1是正电荷，q2是负电荷，且q1＜|q2|
C. q1是负电荷，q2是正电荷，且|q1|＞q2
D. q1、q2都是负电荷，且|q1|＜|q2|
2.选择题- (共1题)
阅读理解
In the last few years the popularity of eBooks has exploded．The advantages are clear：You can carry as many books with you as you want．You can simply download every book you like and instantly start reading instead of having to wait for the book to arrive by mail．
However，one thing hadn't changed．If you wanted to rent a book you were still forced to use hardcopy books．Until now that is, Amazon．com recently announced the start of a new program where you can rent eBooks．
Where to rent eBooks？
As mentioned before，Amazon．com is the first and currently the only retailer (零售商) that has a program in place for renting eBooks． Luckily，Amazon is the largest online retailer in the world and their eBook assortment (分类) is massive．They are also the producer of the Kindle，the most popular Reader，which means you can be sure that the eBooks you rent will work．
You can currently only rent Textbooks．But this is likely to change as soon as word gets out that you can save money by renting eBooks.
Why rent eBooks at Amazon?
* Save money：Save up to 80% of the normal price of the eBook．
* Decide how long you rent：From 30 days to 360 days，you decide how long you want it．You can extend the time by as little as a day．Or simply buy the eBook if you want to keep it after all．
*Use any device：If you rent an eBook from Amazon，you can read it on your PC，Mac，iPad，iPhone，Android device，Windows Phone 7．Blackberry．or Kindle．
* Keep your notes：Do you like to keep annotations (注释) and highlights in your eBooks？Don't worry．You can always revisit your notes and highlights through Amazon．com．
How to rent eBooks？
Simply search for the eBook you want to rent on Amazon．com and select the "Rent eBooks" option. After that，a new page will open where you can select how long you'd like to rent the eBook．You can read eBooks for a period of 30 to 360 days．
You decide how long you need the eBook．If you later find out you need it for longer, you can simply extend the time．Or buy it for the normal price whenever you want.
Once you've chosen the time you want to rent the eBook，you simply go to checkout．Or you can use the "Rent now" button．
3.多选题- (共4题)
A. 物块带正电荷 B. 物块带负电荷
C. 匀强电场的场强大小为
D. 匀强电场的场强大小为
A. 两木块速度大小与质量成反比 B. 两木块所受冲量的大小相等
C. 两木块加速度大小相等 D. 两木块具有完全相同的动量
| A．若A、B为异种电荷，B球可能做圆周运动 |
| B．若A、B为异种电荷，B球一定做加速度、速度均变小的曲线运动 |
| C．若A、B为同种电荷，B球一定做远离A的变加速曲线运动 |
| D．若A、B为同种电荷，B球的动能一定会减小 |
A． | B． | C． | D． |
4.解答题- (共2题)
（ g 为重力加速度），小球运动过程中的电荷量保持不变，忽略圆管和轨道的摩擦阻力．求：
(1)小球到达B点时速度的大小；
(2)小球到达B点时对圆弧轨道的压力；
(3)请通过计算判断小球能否通过圆弧轨道上的C点。
（未知）水平抛出，两长为L的平行金属板M.N倾斜放置且水平方向间的夹角为
，带电小球恰好能垂直M板从其中心小孔B进入两板间（sin37°="0.6," g取10m/s2）（1）试求带电小球抛出时的初速度
；（2）若该平行金属板M.N间有如图所示的匀强电场，且匀强电场的电场强度大小与小球质量之间的关系满足
，试计算两平行板M.N之间的垂直距离d至少为多少时才能保证小球不打在N板上.
5.实验题- (共1题)
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【1】题量占比
单选题:(6道)
选择题:(1道)
多选题:(4道)
解答题:(2道)
实验题:(1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：6
7星难题：0
8星难题：5
9星难题：0