[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fymREGfQ-pQb4r0X2XG_TSxtckMuvinb-ZD6vML0f9FM":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2023-05-10 17:51:02",4214116,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fad87ca29667862d1b28ea52c4f02c023.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8808cb76523adbb62308d09db0577058.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff8dd055e70941c9716d4553aa906c269.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb449c3e4ba577722fed7c217628e68d7.webp\">",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},14,"05cc272230f763aa814d04fc4b242c05","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb71f5ef0bc91dad807788d7bf753eb02.png","大学物理","11964d5f34564850a12e066ea6a0ccbb","8.3测验","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\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3785d3b8762f79d19d31fee989fbb0e0.webp\">",[21,26,35,41,49,55,64,73,82,90],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],4214117,[30,31,32,33],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe74089dae4b039547b6b42a5faef1619.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F373aa639bdfeb94422a72c8737da1be7.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd627e302b216d890a25e47217dde3b46.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb7163787be306969ee86cecf0fca5fee.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",{"answer":36,"createTime":5,"id":37,"options":38,"question":40,"source":24,"type":25},[],4214118,[8,9,39,10],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7c544ff81c69835e317155e086b66166.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",{"answer":42,"createTime":5,"id":43,"options":44,"question":48,"source":24,"type":25},[],4214119,[30,45,46,47],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa05b83b9a5a4fd8dda95188ff347ec72.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb6d54bfffe59ce49de7dc7d4ad800274.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe5b78adffe473a7f300ac1061a1cc1fe.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",{"answer":50,"createTime":5,"id":51,"options":52,"question":54,"source":24,"type":25},[],4214120,[47,30,53,45],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2102113ec0728b9ab6816ce781a4240c.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",{"answer":56,"createTime":5,"id":57,"options":58,"question":63,"source":24,"type":25},[],4214121,[59,60,61,62],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7d87009f04833b5687f220e55cb2e4a8.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1516b5c5cdfadd82190ac928807de0d0.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4bcec93e8e1a05fa0868cd30d6190966.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1adada2d0a1f21cee0fc3469b06e5450.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",{"answer":65,"createTime":5,"id":66,"options":67,"question":72,"source":24,"type":25},[],4214122,[68,69,70,71],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F16fe9f92cc83aa74b64b93082b4d9421.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff1c4b295bf182cc5aa159f146234b79.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa2bf31ef041a543bc8484cd0962a78b3.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff89f924b51821b971d841830df16d0b.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\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F44a931d1b56f8c2b523ae784d895ea6e.png\">",{"answer":74,"createTime":5,"id":75,"options":76,"question":81,"source":24,"type":25},[],4214123,[77,78,79,80],"与正方形的边长成正比","与正方形的边长成反比","与正方形的边长平方成正比","与正方形的边长平方成反比","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",{"answer":83,"createTime":5,"id":84,"options":85,"question":88,"source":24,"type":89},[],4214124,[86,87],"正确","错误","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\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F373aa639bdfeb94422a72c8737da1be7.webp\">",3,{"answer":91,"createTime":5,"id":92,"options":93,"question":94,"source":24,"type":89},[],4214125,[86,87],"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"]