[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fTyPbH-BJqD_XJyvr07tW-be6m7XwMjvqNjXFCerlMNY":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":11,"question":18,"related":19,"source":29,"type":30},[],"2023-07-01 23:35:17",90513003,[8,9,10],"各点的场强均为零","各点的场强均相等","各点的场强均小于零 B、各点的场强不易确定",{"count":12,"courseId":13,"courseImg":14,"courseName":15,"workId":16,"workName":17},15,"885d14f8ee3601bc9629bbb6e6e7763b","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9c1e48361b00f3ee2086f4e259ed792b.jpg","作业","work_28364980","静电场","如果通过任意闭合曲面的电场强度通量为零,一般情况下,在闭合曲面上的( )",[20,31,41,50,59,68,77,86,89,98],{"answer":21,"createTime":5,"id":22,"options":23,"question":28,"source":29,"type":30},[],90512996,[24,25,26,27],"平方正比","平方反比","无关系","反比","设在xy平面内的原点O处有一电偶极子,其电偶极矩P的方面指向y轴正方向,大小不变,电偶极子的中心与O点重合.问在x轴上距原点较远处任意一点的电势与它离开原点的距离是什么关系?( )","v1",0,{"answer":32,"createTime":5,"id":33,"options":34,"question":40,"source":29,"type":30},[],90512997,[35,36,37,38,39],"I1=I2,J1=J2,E1=E2","I1=I2,J1<J2,E1>E2","I1=I2,J1<J2,E1<E2","I1=I2,J1>J2","1>E2","两根长度相同、粗细不同(S1>S2)的铜棒串联在一起,在两端加上一定的电压,那么通过两棒的电流、电流密度及两棒内的电场强度的关系是( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":29,"type":30},[],90512998,[45,46,47,48],"通过该曲面的电场强度通量为零","通过该曲面的电场强度通量大于零","通过该曲面的电场强度通量小于零","该曲面内不可能存在电荷","若某一闭合曲面上的场强处处为零,则( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":29,"type":30},[],90512999,[54,55,56,57],"j1=j2,u1>u2","j1=j2,u1<u2","j1>j2,u1=u2","j1<j2,u1=u2\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F677d3e6ce7e85fe942fbb82bed0c27b8.jpg\">5、如右图所示,有两根无限长直载流导线平行放置,电流分别为I1和I2,L是空间一闭合曲线(逆时针绕行),I1在L内,I2在L外,P是L上的一点,现将I2向I1移近但仍在L外时,则( )A、∮LB·dL与BP同时改变 B、∮LB·dL与BP都不改变C、∮LB·dL不变,BP改变 D、∮LB·dL改变,BP不变","把截面相同、长度相同的铜丝和钨丝串联接在电压为u的直流电路中,铜、钨的电流密度j1、j2和电压u1、u2的关系为(已知铜、钨的电导率Y1>Y2).( )",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":29,"type":30},[],90513000,[63,64,65,66],"场强为O的点,电势一定为O","电势为O的点,场强一定为O","若电势不随空间变化则场强一定为O","若场强不随空间变化则电势一定为O","静电场中,以下说法正确的是( )",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":29,"type":30},[],90513001,[72,73,74,75],"通过铜棒和铁棒的电流相等","通过铜棒和铁棒电流密度相等","铜棒内的电场强度和铁棒内的电场强度相等","铜棒两端的电压和铁棒两端的电压不相等","截面积相同,长度也相同的均匀铜棒和铁棒串联接到直流电路中,以下说法错误的是( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":29,"type":30},[],90513002,[81,82,83,84],"JA=JB,VA=VB","JA>JB,VA>VB","JA<JB,VA<VB","JA>JB,VA<VB","某一导体中A点的场强比B点的场强小,那么这两处的电流密度J及迁移速度V的关系为( )",{"answer":87,"createTime":5,"id":6,"options":88,"question":18,"source":29,"type":30},[],[8,9,10],{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":29,"type":30},[],90513004,[93,94,95,96],"若∮LB·dL=0,则在回路l上必定是B处处为零","若∮LB·dL=0,则在回路l上必定不包围电流","若∮LB·dL=0,则在回路l上所包围的传导电流的代数和为零","若∮LB·dL=0,则在回路l上的各点的B仪与回路L所包围的电流有关","对于安培环路定理的理解正确的是( )",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":29,"type":30},[],90513005,[102,103,104,105],"S面上的电场强度通量不变,P点的场强改变","S面上的电场强度通量不变,P点的场强不变","S面上的电场强度通量改变,P点的场强改变","S面上的电场强度通量改变,P点的场强不变","如右图所示,在静电场中,一闭合曲面S内有一点电荷q,P为S面上的任一点,在S面外有一电荷q′.若将q′从A点沿直线移动到B点,则在移动过程中( )\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F30d0b37e3b0a07983aac8a2422572fdb.png\">"]