[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fUxqTx75qhUOBC81gP6I9pA3RtFQAugyEKFFu0hE-U5o":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-05-10 17:51:02",4214123,[8,9,10,11],"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",{"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","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",[21,32,41,47,55,61,70,79,82,90],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],4214116,[25,26,27,28],"\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\">","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\">","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],4214117,[36,37,38,39],"\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":42,"createTime":5,"id":43,"options":44,"question":46,"source":30,"type":31},[],4214118,[25,26,45,27],"\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":48,"createTime":5,"id":49,"options":50,"question":54,"source":30,"type":31},[],4214119,[36,51,52,53],"\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":56,"createTime":5,"id":57,"options":58,"question":60,"source":30,"type":31},[],4214120,[53,36,59,51],"\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":62,"createTime":5,"id":63,"options":64,"question":69,"source":30,"type":31},[],4214121,[65,66,67,68],"\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":71,"createTime":5,"id":72,"options":73,"question":78,"source":30,"type":31},[],4214122,[74,75,76,77],"\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":80,"createTime":5,"id":6,"options":81,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":83,"createTime":5,"id":84,"options":85,"question":88,"source":30,"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":30,"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"]