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单选题在真空中有一根半径为R的半圆形细导线,流过的电流为I,则圆心处的磁感强度等于

A.

B.

C.

D.

大学物理课程封面

学科：大学物理

时间：2023-05-10 09:51:02

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如图所示,边长为a的正方形的四个角上固定有四个电量均为q的点电荷.此正方形以角速度w 绕AC轴旋转时,在中心O点产生的磁感强度大小为B1;此正方形同样以角速度w 绕过O点垂直于正方形平面的轴旋转时,在O点产生的磁感强度的大小为B2,则B1与B2间的关系为<img src="https://tihai-oss-cloud.itihey.com/img/3785d3b8762f79d19d31fee989fbb0e0.webp">

A. <img src="https://tihai-oss-cloud.itihey.com/img/ad87ca29667862d1b28ea52c4f02c023.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/8808cb76523adbb62308d09db0577058.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/f8dd055e70941c9716d4553aa906c269.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/b449c3e4ba577722fed7c217628e68d7.webp">

半径为R的无限长直圆柱面,沿圆柱面轴向通有电流I,电流在圆柱面上均匀分布.以r表示场点到圆柱面轴线的距离,则圆柱面外的磁感应强度大小为

A. <img src="https://tihai-oss-cloud.itihey.com/img/e74089dae4b039547b6b42a5faef1619.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/373aa639bdfeb94422a72c8737da1be7.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/d627e302b216d890a25e47217dde3b46.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/b7163787be306969ee86cecf0fca5fee.webp">

电量均为q的四个点电荷分别固定在边长为a的正方形的四个角上.正方形以某角速度绕对角线为轴旋转时,在正方形中心产生的磁感应强度大小为B1;以同样角速度绕过中心垂直于正方形平面的轴旋转时,在中心产生的磁感应强度大小为B2,则

A. <img src="https://tihai-oss-cloud.itihey.com/img/ad87ca29667862d1b28ea52c4f02c023.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/8808cb76523adbb62308d09db0577058.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/7c544ff81c69835e317155e086b66166.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/f8dd055e70941c9716d4553aa906c269.webp">

半径为R的圆形细导线中通有电流I,则圆心处的磁感应强度大小为

A. <img src="https://tihai-oss-cloud.itihey.com/img/e74089dae4b039547b6b42a5faef1619.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/a05b83b9a5a4fd8dda95188ff347ec72.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/b6d54bfffe59ce49de7dc7d4ad800274.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/e5b78adffe473a7f300ac1061a1cc1fe.webp">

在真空中有一根半径为R的半圆形细导线,流过的电流为I,则圆心处的磁感强度等于

A. <img src="https://tihai-oss-cloud.itihey.com/img/e5b78adffe473a7f300ac1061a1cc1fe.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/e74089dae4b039547b6b42a5faef1619.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/2102113ec0728b9ab6816ce781a4240c.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/a05b83b9a5a4fd8dda95188ff347ec72.webp">

电量为q的点电荷以速率v作匀速率圆周运动,圆的半径为R,则由运动点电荷激发的圆心处的磁感应强度大小为

A. <img src="https://tihai-oss-cloud.itihey.com/img/7d87009f04833b5687f220e55cb2e4a8.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/1516b5c5cdfadd82190ac928807de0d0.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/4bcec93e8e1a05fa0868cd30d6190966.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/1adada2d0a1f21cee0fc3469b06e5450.webp">

如图所示的闭合回路中,两个共面半圆的半径分别为a和b,且有公共圆心O,当回路中通有电流I时,圆心O处的磁感强度大小等于<img src="https://tihai-oss-cloud.itihey.com/img/44a931d1b56f8c2b523ae784d895ea6e.png">

A. <img src="https://tihai-oss-cloud.itihey.com/img/16fe9f92cc83aa74b64b93082b4d9421.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/ff1c4b295bf182cc5aa159f146234b79.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/a2bf31ef041a543bc8484cd0962a78b3.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/ff89f924b51821b971d841830df16d0b.webp">

正方形线圈通有恒定电流,则此线圈中心点处的磁感应强度大小

A. 与正方形的边长成正比B. 与正方形的边长成反比C. 与正方形的边长平方成正比D. 与正方形的边长平方成反比

载有电流I的无限长直导线,在离直导线距离为r的P点处产生的磁感应强度大小为<img src="https://tihai-oss-cloud.itihey.com/img/373aa639bdfeb94422a72c8737da1be7.webp">

A. 正确B. 错误

载有恒定电流的圆线圈.当圆线圈半径增大时,圆心处的磁场也增大

A. 正确B. 错误

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