1.单选题- (共2题)

A.B点为中垂线上电场强度最大的点,场强![]() |
B.由C到A的过程中物块的电势能先减小后变大 |
C.由C点到A点的过程中,电势逐渐升高 |
D.AB两点电势差![]() |





A. A点电势大于B点电势
B.


C. A、B两点的电场强度相等
D.


2.选择题- (共1题)
注意:1.每处错误及其修改均仅限一词;2.只允许修改10处, 多者(从第11处起)不计分。
The teenage year from 13 to 19 were the most difficult time for me. They were also the best and worse years in my life. At the first, I thought I knew everything but could make decisions by myself. Besides, my parents didn't seem to think so. They always tell me what to do and how to do it. At one time, I even felt my parents couldn't understand me so I hoped I could be freely from them. I showed them I was independent by wear strange clothes. Now I am leaving home for college. At last, I will be on their own, but I still want to have my parents to turn whenever I need help.
3.多选题- (共6题)

A.小球A的动能不断增加 | B.小球的加速度不断减小 |
C.小球的机械能不断减小 | D.小球的电势能不断增加 |

A.α粒子在M点的速率比在Q点的大 |
B.三点中,α粒子在N点的电势能最大 |
C.在重核产生的电场中,M点的电势比Q点的低 |
D.α粒子从M点运动到Q点,电场力对它做的总功为正功 |

A.Ea:Eb=4:1 | B.Ec:Ed=2:1 | C.Wab:Wbc=3:1 | D.Wbc:Wcd=1:3 |





A.电子一定从A向B运动 |
B.若![]() ![]() |
C.无论Q为正电荷还是负电荷一定有![]() ![]() |
D.B点电势可能高于A点电势 |
A.![]() | B.![]() | C.![]() | D.![]() |

A.中垂线为等势线 |
B.粒子由B运动到O点时,速度最大 |
C.粒子由B运动至O点过程,电势能减小 |
D.粒子由B运动至O点过程,电场力增大 |
4.解答题- (共2题)

(1)请描述小球向上运动过程中的速度与加速度的变化情况;
(2)求小球的质量m和电量q;
(3)求斜杆底端至小球速度最大处由底端正点电荷Q形成的电场的电势差U。
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【1】题量占比
单选题:(2道)
选择题:(1道)
多选题:(6道)
解答题:(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:3
5星难题:0
6星难题:6
7星难题:0
8星难题:1
9星难题:0