[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f5CiJzqc7uVzdipWeZLCqjGh7H5oc_Z0xxenLB8g-9Xk":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2023-10-29 00:07:01",102316988,[8,9,10,11],"磁感应线是从N极出发终止于S极的曲线","条形磁铁的磁感应线是从N极到S极的","磁感应线是无头无尾的闭合曲线","条形磁铁的磁感应线是从S极到N极的",{"courseId":13,"courseImg":14,"courseName":15},"2269d654a6e62f4c126cdebfc825e578","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9aa58468cd0e08ddc0c5ab1912c74992.jpg","大学物理[2-2]","下列关于磁感应线的描述,哪个是正确的? ( )",[18,29,38,41,50,60,69,78,87,96],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],102316983,[22,23,24,25],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Feb64c6482b690277ed053b5a7a683e22.png\">(T)","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F95050b7cdd01a8d1d45964d2e6750d26.png\">(T)","0","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc14b6ad301e1d473c4f7496c66e10e17.png\">(T)","两条无限长载流导线,间距为0.5 cm,电流为20 A,电流方向相同,在两导线间距中点处磁场强度大小为( )","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],102316987,[33,34,35,36],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcf7fb43bc463d1a26a030077e309ab3d.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5eb256ae0ae9783f4a1487339fa0195c.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8e742fa284f237af2c9df4b283a010c9.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7442f934515ec8df24e4fb963d73dc08.png\">","在磁感强度为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F52c436000ea67b429815972858cec388.png\">的均匀磁场中作一半径为r的半球面S,S边线所在平面的法线方向单位矢量\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F230cd125219eddd400b24e98c492775e.png\">与\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F52c436000ea67b429815972858cec388.png\">的夹角为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0f7bde4d73a9b74349d94371fbefcf9e.png\">,则通过半球面\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0760763ba0c61315238d8065a5a8b405.png\">的磁通量为( )",{"answer":39,"createTime":5,"id":6,"options":40,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":27,"type":28},[],102316989,[45,46,47,48],"通以反向电流时,互相吸引","通以同向电流时,互相排斥","通以同向电流时,互相吸引","通以反向电流时,没有磁场力","在同一平面内有两根平行的通电导线\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F69a48fefd33cd6160c31522a819600e5.png\">、\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F18657464121d930c7e85c79edb959298.png\">,关于它们相互作用力方向的判断正确的是( )",{"answer":51,"createTime":52,"id":53,"options":54,"question":59,"source":27,"type":28},[],"2023-10-29 00:07:02",102316991,[55,56,57,58],"增加磁场B","减少速率v","增加θ角","减少磁场B","质量为m电量为q的粒子,以速率v与均匀磁场B成θ角射入磁场,轨迹为一螺旋线,若要增大螺距则要( )",{"answer":61,"createTime":52,"id":62,"options":63,"question":68,"source":27,"type":28},[],102316992,[64,65,66,67],"若环流等于零,则在回路L上必定不包围电流","若环流等于零,则在回路L所包围传导电流的代数和为零","回路L上各点的B仅与回路L包围的电流有关","若环流等于零,则在回路L上必定是B处处为零","对于真空中安培环路定理的理解,正确的是:( )",{"answer":70,"createTime":52,"id":71,"options":72,"question":77,"source":27,"type":28},[],102316993,[73,74,75,76],"2.4J","0.24J","0.14J","14J","一个100匝的圆形线圈,半径为5厘米,通过电流为0.1安,当线圈在1.5T的磁场中从θ=0的位置转到180度(θ为磁场方向和线圈磁矩方向的夹角)时磁场力做功为( )",{"answer":79,"createTime":52,"id":80,"options":81,"question":86,"source":27,"type":28},[],102316994,[82,83,84,85],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F531484efd7e479c14b841df18d053489.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2037f53aaf79db00d942a9e401c92e84.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6aae4a028aefbfae4c04e3cd0b408cbb.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5e23a44fef631a91e321aeaef97caa17.png\">","长直导线通过电流I,中部被弯折成3\u002F4圆弧形,如图所示,则圆心O点的磁感应强度大小为 ( ) \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7ea459544b173fc310a0aee6dffe9ef6.png\">",{"answer":88,"createTime":52,"id":89,"options":90,"question":95,"source":27,"type":28},[],102316995,[91,92,93,94],"0.6 T.(已知真空的磁导率µ0 =4π×10-7 T·m\u002FA)","6×10-3 T","1.9×10-2T","3×10-5T","距一根载有电流为 3×104 A 的电线 1 m 处的磁感强度的大小为 ( )",{"answer":97,"createTime":52,"id":98,"options":99,"question":104,"source":27,"type":28},[],102316997,[100,101,102,103],"通电螺线管的磁极可以对调","螺线管周围一定存在磁场","安培定则是用来判定电流方向与磁极方向的","知道通电螺线管的南北极就可判断出电流的方向","下列说法错误的是( )"]