如图所示,半径为R,电荷线密度为λ（λ>0)的均匀带电圆环,绕圆心且与圆平面垂直的轴以角速度ω

A . 0.0261 B . 0.0617 C . 0.0452 D . 0.0551

A .https://assets.asklib.com/psource/2015110114055459111.jpg B .https://assets.asklib.com/psource/2015110114060858725.jpg C .https://assets.asklib.com/psource/2015110114062064666.jpg D .https://assets.asklib.com/psource/2015110114063237571.jpg

A . 0.0261 B . 0.0617 C . 0.0452 D . 0.0551

A . （λ／4πε）ln2 B . （λ／2πε）ln3 C . （λ／4πε）ln（1／2） D . （λ／2πε）ln2

<img src='https://img2.soutiyun.com/ask/2020-11-19/974672657164018.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-15/971629097717634.png' /> (1)判别腔的稳定性; (2)求输出端光斑大小; (3)若输出端刚好位于焦距F=0.1m的薄透镜焦平面上，求经透镜聚焦后的光腰大小和位置。

<img src='https://img2.soutiyun.com/ask/2021-02-14/982167363192026.png' />

如图 5-44(a)所示,半径为R的均勾带电球面,带有电荷Q,沿某一半径方向上有一均匀带电细线，电荷线密度为<img src='https://img2.soutiyun.com/shangxueba/ask/65109001-65112000/65111975/957108555344651.png' />,长度为I,细线左端离球心距离为a.设球和线上的电荷分布不受相互作用影响,试求细线所受球面电荷的电场力和细线在该电场中的电势能(设无穷远处的电势为零)。 <img src='https://img2.soutiyun.com/ask/2020-04-30/95710856405086.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-01/962459710924663.png' />

在0xy面上倒扣着半径为R的半球面,半球面上电荷均匀分布,电荷面密度为σ.A点的坐标为(0,R/2) ,B点的坐标为(3R/2,0),求电势差UAB. <img src='https://img2.soutiyun.com/ask/2020-07-20/964101823568829.png' />

<img src='https://img2.soutiyun.com/ask/uploadfile/9099001-9102000/830665b5f5fe256d269e94008c800e50.jpg' />(1)判别腔的稳定性； (2)求输出端光斑大小； (3)若输出端刚好位于焦距F=0．1m的薄透镜焦平面上，求经透镜聚焦后的光腰大小和位置。

<img src='https://img2.soutiyun.com/ask/2020-09-30/970334285383906.jpg' />

长l=15.0cm的直导线AB上均匀地分布着线密度λ=5.0x109-9c●m-1的正电荷。试求：在导线的延长线上与导线B端相距a1=5.0cm处P点的场强：(2)在导线的垂直平分线上与导线中点相距d2=5.0cm处Q点的场强。 <img src='https://img2.soutiyun.com/ask/2020-06-17/961239773296037.png' />

<img src='https://img2.soutiyun.com/ask/2020-05-29/959616701022353.png' /> (1)电介质中的电场强度E、电位移D和极化强度P; (2)电介质表面的极化电荷面密度σ'。

<img src='https://img2.soutiyun.com/ask/2021-02-08/981645647462273.png' />

<img src='https://img2.soutiyun.com/ask/2021-02-03/981215316319302.png' />

一无限长圆柱面,其电荷面密度为<img src='https://img2.soutiyun.com/ask/2020-04-30/957107726124018.png' />.式中<img src='https://img2.soutiyun.com/ask/2020-04-30/957107739133835.png' />为半径R与x轴所夹的角，如图5-21所示。试求圆柱轴线上一点的场强。 <img src='https://img2.soutiyun.com/ask/2020-04-30/957107750785014.png' />

如图5-38所示，一锥顶角为<img src='https://img2.soutiyun.com/ask/2020-04-30/957108379267003.png' />的圆台,上下底面半径分别为r和R ,在它的侧面上均匀带电，电荷面密度为σ,求顶点O的电势。(以无穷远处为电势零点) <img src='https://img2.soutiyun.com/ask/2020-04-30/95710839144979.png' />

<img src='https://img2.soutiyun.com/ask/2020-11-09/973806805768531.png' />

<img src='https://img2.soutiyun.com/ask/2021-02-18/982510435603551.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-22/964281249714169.png' /> A、<img src='https://img2.soutiyun.com/ask/2020-07-22/96428126108882.png' /> B、<img src='https://img2.soutiyun.com/ask/2020-07-22/96428127157442.png' /> C、<img src='https://img2.soutiyun.com/ask/2020-07-22/964281285841236.png' /> D、<img src='https://img2.soutiyun.com/ask/2020-07-22/964281300748088.png' />