[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fpmTNpyzoYNmFF0_CxNiYsUaPoTNAaLU70sBMS7CwLHY":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-06-21 09:11:37",205646756,[8,9,10,11],"电场不随时间而变化","电场随时间而变化","交流电路","在接通直流电路的瞬时",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},25,"d6b25474a36debbd3e70883cc735e166","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F64a0b0bab18da0fe9f436d66d844f95a.jpeg","大学物理B（上）-2024-2025-2","exam_163756275","作业-9电磁感应 电磁场(算平时作业分)","B9-1-9*下列哪种情况的位移电流为零?( )",[21,32,41,50,59,68,77,86,95,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],205646741,[25,26,27,28],"静电场","稳恒磁场","感生电场","变化的磁场","B9-1-1*下列哪些矢量场为保守力场()","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],205646742,[36,37,38,39],"沿垂直磁场方向平移","以直径为轴转动,轴跟磁场垂直","沿平行磁场方向平移","以直径为轴转动,轴跟磁场平行","B9-1-2*一圆形线圈在均匀磁场中作下列运动时,哪些情况会产生感应电流()",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],205646743,[45,46,47,48],"把线圈的匝数增加到原来的两倍","把线圈的面积增加到原来的两倍,而形状不变","把线圈切割磁力线的两条边增长到原来的两倍","把线圈的角速度w增大到原来的两倍","B9-1-3*闭合正方形线圈放在均匀磁场中,绕通过其中心且与一边平行的转轴OO'转动,转轴与磁场方向垂直,转动角速度为w,如图所示.用下述哪种办法可以使线圈中感应电流的幅值增加到原来的两倍(导线的电阻不能忽略)?()\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc5378cfbbb90d445d226d1c37d2f4a03.png\">",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],205646744,[54,55,56,57],"2abB|coswt|","wabB|sinwt|","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb8a247e0f428c51c21bff35a1e8397f8.png\">","wabB|coswt|","B9-1-4*一矩形线框长为a宽为b,置于均匀磁场中,线框绕OO'轴匀角速度w旋转(如图所示).设t=0时,线框平面处于纸面内,则任一时刻感应电动势的大小为:( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7c91ebd98028506c90a3078dd6d92900.png\">",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],205646745,[63,64,65,66],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc1040cb53f7248f4a452e1b0b5c4c6c5.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd1f9a98514c4b10880d9ca69c3c999a6.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa0f3d3d604e4b554cda7bd624a8cb3e6.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff0cea9685030d27206f4ec52fd309993.png\">","B9-1-5*一根长度为L的铜棒,在均匀磁场 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F017b21edf34fa5c5b186c6e95d5ca7b3.png\">中以匀角速度绕通过其一端的定轴旋转着,\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F017b21edf34fa5c5b186c6e95d5ca7b3.png\">的方向垂直铜棒转动的平面,如图所示.设t =0时,铜棒与Ob成角(b为铜棒转动的平面上的一个固定点),则在任一时刻t这根铜棒两端之间的感应电动势是 ( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4718c4b424a04e9f22b913322c5f4352.png\">",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],205646746,[72,73,74,75],"ε=0,Ua-Uc=Bωl2","ε=0,Ua-Uc=-Bωl2","ε=Bωl2,Ua-Uc=Bωl2","ε=Bωl2,Ua-Uc=-Bωl2","B9-1-6*如图所示,直角三角形金属框架abc放在均匀磁场中,磁场B平行于ab边,bc的长度为l.当金属框架绕ab边以匀角速度ω转动时,abc回路中的感应电动势ε和a,c两点间的电势差Ua-Uc为( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff939165692b46c1c8f521dc351e5a3d9.png\">",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],205646748,[81,82,83,84],"铜环中有感应电流,木环中无感应电流","铜环中有感应电流,木环中有感应电流","铜环中感应电动势大,木环中感应电动势小","铜环中感应电动势小,木环中感应电动势大","B9-1-7*将形状完全相同的铜环和木环静止放置在交变磁场中,并假设通过两环面的磁通量随时间的变化率相等,不计自感时则:()",{"answer":87,"createTime":5,"id":88,"options":89,"question":94,"source":30,"type":31},[],205646751,[90,91,92,93],"a导体产生自感电流,b导体产生互感电流","b导体产生自感电流,a导体产生互感电流","两导体同时产生自感电流和互感电流","两导体只产生自感电流,不产生互感电流","B9-1-8*如图所示,两个圆环形导体a、b互相垂直地放置,且圆心重合,当它们的电流I1、和I2同时发生变化时,则( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F27a078f0b204439811f442a42fb88728.png\">",{"answer":96,"createTime":5,"id":6,"options":97,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],205646760,[102,103,104,105],"314V\u002Fm,方向由a指向b","6.28 V\u002Fm,方向由a指向b","3.14 V\u002Fm,方向由b指向a","628 V\u002Fm,方向由b指向a","B9-1-10*如图所示,一根长为1m的细直棒ab,绕垂直于棒且过其一端a的轴以每秒2转的角速度旋转,棒的旋转平面垂直于0.5T的均匀磁场,则在棒的中点,等效非静电性场强的大小和方向为( ).\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8cc0bddc171cebfa8e31ec0aab966573.png\">"]