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【试题评析】2026年四川省高考物理试题分析第6题

【试题评析】2026年四川省高考物理试题分析第6题

 【题目】如图所示,边长为 l 的绝缘菱形支架EFGH竖直放置,FG边固定于水平地面,∠EFG = 60°。E、G两点各固定一带电小球,两小球带等量异种电荷。点 H、 F间固定一光滑绝缘直轨道,另一带电小球 q 从 H点沿轨道由静止下滑至 F点。重力加速度大小为 g,小球均可视为点电荷。则小球 q 在运动过程中(    )

A.某时刻所受支持力可能为零 

B.到达F点时的速率为

C.电势能先增大后减小 

D.所受电场力的冲量为零 

【答案】A 

【解析】根据菱形几何性质和等量异种电荷的电场特点可知,HF轨道位于等量异种电荷连线的中垂线上,因此HF轨道上各点电势处处相等。在运动过程中,小球始终受到竖直向下的重力、垂直于轨道的支持力、以及沿中垂线方向(平行于EG连线)的电场力。当电场力沿垂直轨道方向的分力与重力垂直轨道的分力大小相等、方向相反时,支持力 ,这种情况是可能存在的,选项A正确。由于HF轨道是等势线,电场力方向始终垂直于轨道,因此在整个运动过程中电场力不做功。只有重力做功,由几何关系得下落高度 ,根据动能定理:,解得 ,选项B错误。由于HF轨道是等势线,整个运动过程中小球电势不变,电势能不变,选项C错误。冲量是矢量。等量异种电荷中垂线上电场方向始终不变(均平行于EG连线且指向负电荷一侧),因此电场力方向始终不变,但大小在变化。由于电场力是变力,但其方向恒定,整个过程电场力的总冲量不为零,选项D错误。

 【试题情境】 

本题以绝缘菱形支架上等量异种电荷形成的电场为背景,结合带电小球在重力场与电场中的运动,以文字+物理模型示意图方式呈现,属于学习探索情境。情境素材来源于等量异种电荷电场与几何模型的深度结合,属于模型类命题情境。试题情境与电场力、电势、动能定理、冲量等知识高度嵌入,需综合运用电场与力学知识,属于较为复杂情境,突出应用性与综合性。 

【必备知识】

本题考查必修3中II级考点:等量异种电荷的电场线分布与电势分布、电场力做功与电势能变化的关系、动能定理、冲量的概念与计算;必修1中I级考点:支持力、受力分析。等量异种电荷电场线分布特点、中垂线电势特点、电场力做功特点属于陈述性知识;利用动能定理求速率、分析电场力不变但冲量不为零属于程序性知识;将电场与几何模型结合进行受力分析属于策略性知识。 

【课标要求】 

必修3:3.1.3了解电场强度,能用电场线描述电场。 

必修3:3.1.5知道电势能、电势,理解电势差。 

选择性必修1:1.1.1理解冲量,能用动量定理分析变力问题。 

【素养等级】

 (1) 本题考查物理观念中的物质观念、运动与相互作用观念、能量观念,能理解等量异种电荷的电场分布特点,并应用动力学、能量观点分析带电小球的运动,达到学业质量水平2要求。

 (2) 本题考查科学思维,能构建等量异种电荷电场模型,运用几何关系、电场力做功特点、动能定理和冲量概念进行推理判断,能对B、C、D选项提出质疑并分析,达到学业质量水平2要求。 

【能力要求】

本题着重考查模型建构能力、信息加工能力、逻辑推理能力。

 (1)模型建构能力:将等量异种电荷的电场模型与菱形几何结构结合,建立“中垂线电场模型”与“匀强模型”的等效转化思维。

 (2)信息加工能力:从题干中提取“等量异种电荷”、“菱形边长为l”、“∠EFG=60°”、“光滑绝缘直轨道”等关键信息,并将其转化为物理条件和几何关系。

 (3)逻辑推理能力:根据等量异种电荷的电场特点,判断HF轨道为等势面(线),进而推理电场力方向、做功情况、电势能变化;结合受力分析推理支持力可能为零的条件;运用冲量定义判断电场力冲量是否为零。 

【问题复杂性分析】

【试题难度】

【命题综述】

【基于高考评价体系的多维命题细目表】

【拓展延伸】 

拓展1:若将E、G两点的等量异种电荷改为等量同种正电荷,则HF轨道上各点的电势分布如何?小球q从H滑至F的过程中,其电势能和速率将如何变化?请给出定性分析。 

解析:等量同种正电荷的连线上,中点电势最低;中垂线上,从连线中点向外,电势逐渐降低,且关于连线对称。HF轨道位于EG的中垂线上,因此轨道上各点电势不相等,从H沿轨道到F,电势先降低后升高(在连线中点处最低)。小球q(假设带正电)的电势能 ,因此电势能先减小后增大。由于电场力做功,小球速率不再只由重力决定。根据能量守恒,动能可能先增大后减小,速率先增大后减小(具体取决于电场力与重力的大小关系)。 

拓展2:本题中,A选项提到“某时刻所受支持力可能为零”。请分析,若要使这种情况真实发生,需要对小球的质量m、电荷量q以及电场强度E满足什么关系?请结合几何关系和受力分析,写出支持力为零的推导条件。 

解析:在HF轨道上某点,设该点处轨道切线与水平方向的夹角为θ,则重力沿垂直轨道方向的分力为 ,方向垂直轨道向里(指向圆心)。等量异种电荷在中垂线上产生的电场强度方向沿EG连线,设其大小为E。该电场力沿垂直轨道方向的分力为 ,方向垂直于轨道向外(指向圆心)或向里,取决于q的电性(假设q带正电,则电场力方向沿EG指向G,垂直轨道分力向外)。要使支持力为零,需满足 ,即 。可见,只要在轨道上某点,电场强度E和轨道倾角θ满足上述关系,支持力即可为零。由于E沿轨道变化,因此存在满足条件的可能性。 

拓展3:本题中D选项说“电场力的冲量为零”是错误的。请计算,若小球质量为m,从H滑到F的时间为T,则此过程中电场力对小球的冲量大小和方向如何?(提示:冲量等于力对时间的积累,方向与力的方向一致) 

解析:电场力方向始终沿EG连线方向(设E为正,G为负,则方向沿EG指向G)。电场力大小 ,由于E沿中垂线变化,因此F_E是变力,但其方向始终不变。冲量 ,方向沿EG指向G。由于小球在运动过程中水平方向(EG方向)有速度分量,且电场力在该方向产生加速度,因此小球在EG方向上的动量变化不为零,即电场力的冲量不为零。具体计算需要知道电场强度E沿轨道的分布规律以及小球运动时间T,但定性分析可确定冲量大小不为零、方向沿EG连线。

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  1. CONNECT:[ UseTime:0.001085s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001721s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009603s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005730s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001895s ]
  6. SELECT * FROM `set` [ RunTime:0.000666s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001848s ]
  8. SELECT * FROM `article` WHERE `id` = 865726 LIMIT 1 [ RunTime:0.041486s ]
  9. UPDATE `article` SET `lasttime` = 1784733749 WHERE `id` = 865726 [ RunTime:0.032584s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.004687s ]
  11. SELECT * FROM `article` WHERE `id` < 865726 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009212s ]
  12. SELECT * FROM `article` WHERE `id` > 865726 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001333s ]
  13. SELECT * FROM `article` WHERE `id` < 865726 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003079s ]
  14. SELECT * FROM `article` WHERE `id` < 865726 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008517s ]
  15. SELECT * FROM `article` WHERE `id` < 865726 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014033s ]
0.240367s