[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f45THJtnrRTe8slerBjJJaOpL6qmcrulECeDPZMjnqo8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-05-10 17:51:35",4216069,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe99c9cbb8ee8df531ce612cd94d53b9d.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F48ea8108d242919b77070db29e022776.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F58d01f0727658753e6d690d207dcbb15.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F33ea506ab3ddc7dded8e3638b94a798d.webp\">",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},8,"05cc272230f763aa814d04fc4b242c05","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb71f5ef0bc91dad807788d7bf753eb02.png","大学物理","24d31bf79cbc43eabc035650400ff2c3","8.4测验","通有电流I的空芯长直螺线管,单位长度线圈的匝数为n,螺线管内的磁感应强度大小等于",[21,32,41,50,59,68,77,84],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],4216062,[25,26,27,28],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F60b9ead6e3512d677ccd85da58a178c3.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb71f51d5f76865fe49da17e6e8ad78a7.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fdff96486edd4fdd324f9c74cd358d466.webp\">","0","磁感强度大小为B的均匀磁场垂直于半径为r的圆面.今以该圆周为边线,作一半球面S,则通过S面的磁通量大小等于","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],4216063,[36,37,38,39],"Bi、Be均与r成正比","Bi、Be均与r成反比","Bi与r成反比,Be与r成正比","Bi与r成正比,Be与r成反比","无限长直圆柱体,半径为R,沿轴向通有稳恒电流,电流在横截面上均匀分布.设圆柱体内( r < R )的磁感强度为Bi,圆柱体外( r > R )的磁感强度为Be,则有",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],4216064,[45,46,47,48],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd627e302b216d890a25e47217dde3b46.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb7163787be306969ee86cecf0fca5fee.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F373aa639bdfeb94422a72c8737da1be7.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2067c04455f2c5f764f2907cdfe50f75.webp\">","有一长直圆柱面,沿长度方向通有稳恒电流I,电流在横截面上均匀分布.圆柱面外空间中离轴线r处的磁感强度等于",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],4216065,[54,55,56,57],"2:1","1:1","1:2","4:1","横截面是圆形的两个螺线管,单位长度上的匝数相等,横截面半径之比为2:1.通过相等电流时,两螺线管中的磁感强度大小之比为",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],4216066,[63,64,65,66],"环路L上磁感应强度的环流等于零,且环路上任意一点磁感应强度等于零","环路L上磁感应强度的环流等于零,且环路上任意一点磁感应强度不等于零","环路L上磁感应强度的环流不等于零,且环路上任意一点磁感应强度不等于零","环路L上磁感应强度的环流不等于零,且环路上任意一点磁感应强度等于零","在电流为I的圆形闭合导线所在的平面内,选取一个同心圆形闭合回路L,则由安培环路定理可知",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],4216067,[72,73,74,75],"不能用安培环路定理来计算","可以直接用安培环路定理求出","只能用毕奥-萨伐尔定律求出","可以用安培环路定理和磁感强度的叠加原理求出","若空间存在两根无限长直载流导线,空间的磁场分布就不具有简单的对称性,则该磁场分布",{"answer":78,"createTime":5,"id":79,"options":80,"question":83,"source":30,"type":31},[],4216068,[81,47,45,82],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fef16c3592c05f3fce75e5d37b9251697.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6bf8726d14c98884fc8c22b450b07da5.webp\">","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等于",{"answer":85,"createTime":5,"id":6,"options":86,"question":19,"source":30,"type":31},[],[8,9,10,11]]