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如图所示,边长为a的等边三角形的三个顶点上,分别放置着三个正的点电荷q、2q、3q.若将另一正点电荷Q从无穷远处移到三角形的中心O处,外力所作的功为
A. 
B. 
C. 
D. 
学科：大学物理A（上）2023-2024（2）
时间：2024-05-07 13:59:38
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题目1多选题
电荷面密度均为+<img src="https://tihai-oss-cloud.itihey.com/img/031b6cb559fea5c8f0c7095f3603ddf0.png">的两块"无限大"均匀带电的平行平板如图放置,则A、B、C三个区域的电场强度分别为(设方向向右为正):<img src="https://tihai-oss-cloud.itihey.com/img/c607fc71176265d99f35c4c35f42847d.jpg">A. <img src="https://tihai-oss-cloud.itihey.com/img/440eaefe9dd1268294306de87e19a3aa.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/8f5b381fada6aa72bbd14f8c531d8b98.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/702b343edc762a2626fa7c63b0822b6d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/efb3afe51d04f8c5df0972cb71a2c34e.png">
题目2多选题
有一边长为a的正方形平面,在其中垂线上距中心O点a/2处,有一电荷为q的正点电荷,如图所示,则通过该平面的电场强度通量为:<img src="https://tihai-oss-cloud.itihey.com/img/dcb0484313a0c531cfccac0f392761a6.jpg">A. <img src="https://tihai-oss-cloud.itihey.com/img/ac28f51841bca5a87d7d8a96665db7e4.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/b1a0af7d1eaaa2f79db144ee35f8e7de.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/e79efe1ba5fb5250291ff4ddfad8d5da.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/6ff674984bcf273aa146d980d66f8e88.png">
题目3多选题
一电场强度为<img src="https://tihai-oss-cloud.itihey.com/img/7bae1734d22e770bf84a7ef509fb127e.png">的均匀电场,<img src="https://tihai-oss-cloud.itihey.com/img/7bae1734d22e770bf84a7ef509fb127e.png">的方向与沿x轴正向,如图所示.则通过图中一半径为R的半球面的电场强度通量为<img src="https://tihai-oss-cloud.itihey.com/img/54c238364aefbd40ee273abafb0a5974.jpg">A. <img src="https://tihai-oss-cloud.itihey.com/img/5191531d71862ef1263e7cfb139e05c2.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/556ce1eb8a5d97ebaf0928da0ee9f2c6.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/a3d72b79e9e1a0df0c61bd3b063b2006.png">D. 0
题目4多选题
如图所示,为具有球对称性分布的静电场的E~r关系曲线.该静电场是由下列哪种带电体产生的:<img src="https://tihai-oss-cloud.itihey.com/img/0c1cab8d9ef3b65cbbb1d603ac440247.png">A. 半径为R的均匀带电球面B. 半径为R的均匀带电球体C. 半径为R、电荷体密度为ρ=Ar (A为常数)的非均匀带电球体D. 半径为R、电荷体密度为ρ=A/r (A为常数)的非均匀带电球体
题目5多选题
<img src="https://tihai-oss-cloud.itihey.com/img/5ff7d94d57b5085c9fc67978e1fde108.png">在点电荷+q的电场中,若取图中P点处为电势零点 , 则M点的电势为A. <img src="https://tihai-oss-cloud.itihey.com/img/766982be6e462eb74f1c91b2f3ef1273.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/f33e3b7519c45555d9b2ae991f8c5d7c.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/a71c36e3d17229d21b2b27bbb8449823.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/9a4d1109f85cfb1d0f6280a512a5fcc5.png">
题目6多选题
<img src="https://tihai-oss-cloud.itihey.com/img/f1caa47bac567dcd968ee4399ea66839.png">如图所示,半径为R的均匀带电球面,总电荷为Q,设无穷远处的电势为零,则球内距离球心为r的P点处的电场强度的大小和电势为A. E=0,<img src="https://tihai-oss-cloud.itihey.com/img/f7da91d8c886a13eba5bb528893ee169.png">B. E=0,<img src="https://tihai-oss-cloud.itihey.com/img/46e6649bcbfe797307a51782a53eb18f.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/7f35572982a3722c98291f5e6d8ea155.png">,<img src="https://tihai-oss-cloud.itihey.com/img/f7da91d8c886a13eba5bb528893ee169.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/7f35572982a3722c98291f5e6d8ea155.png">,<img src="https://tihai-oss-cloud.itihey.com/img/f7614164d4ce4cae6ba54cc249c1eaa3.png">
题目7多选题
半径分别为R和r的两个金属球,相距很远.用一根细长导线将两球连接在一起并使它们带电.在忽略导线的影响下,两球表面的电荷之比为A. R / rB. R2 / r2C. r2 / R2D. r / R
题目8多选题
一空心导体球壳,其内、外半径分别为R1和R2,带电荷q,如图所示.当球壳中心处再放一电荷为q的点电荷时,则导体球壳的电势(设无穷远处为电势零点)为<img src="https://tihai-oss-cloud.itihey.com/img/4a13ccc47efb4979832c9c96c6801f58.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/734023b45d06a2d5f1f9b2aab9b22d03.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/a2ce3a92fb20438ed5804d5943678bbd.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/8b85401e887eda91794008e3e41f2941.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/aba92a32a005b8bc9e6c42bd292d826b.png">
题目9多选题
在静电场中,作闭合曲面S,若有<img src="https://tihai-oss-cloud.itihey.com/img/30837695cb9b94c3d91d5b861f746882.png"> (式中<img src="https://tihai-oss-cloud.itihey.com/img/b633d819953a770efab131fea539c602.png">为电位移矢量),则S面内必定A. 既无自由电荷,也无束缚电荷B. 没有自由电荷C. 自由电荷和束缚电荷的代数和为零D. 自由电荷的代数和为零
题目10多选题
<img src="https://tihai-oss-cloud.itihey.com/img/07b6a26202c5ff560e58be0d96d38f6b.png">如图所示,边长为a的等边三角形的三个顶点上,分别放置着三个正的点电荷q、2q、3q.若将另一正点电荷Q从无穷远处移到三角形的中心O处,外力所作的功为A. <img src="https://tihai-oss-cloud.itihey.com/img/f946ebab6b435cfb75bf834214e10915.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/97a4281776e452537da677419ea1f356.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/d477b378764d320f5610dd866602db8c.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/7fdcd451cbbad810a8a9bd59020a1ee0.png">
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