[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f1-_LPrLQwdh4VFIBPYYKcVdBYZ-PThPQ1X6fA2vk0pI":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":15,"related":16,"source":20,"type":21},[],"2026-05-10 09:19:37",1096665159,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4e9e68c9280686f0044382757bc57492.PNG\">","铁磁质的相对磁导率µr >>1, 且为常数","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F119137fa91357a8af108fed4411fed28.PNG\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fdeb2682196077f4791d10522a8adf3ac.PNG\">",{"courseImg":13,"courseName":14},"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0637f594f6a1d6f974533a5e15080a7b.jpg","电磁学","关于磁介质, 下列叙述中正确的是",[17,22,30,40,49,58,63,72,77,86],{"answer":18,"createTime":5,"id":6,"options":19,"question":15,"source":20,"type":21},[],[8,9,10,11],"v2",0,{"answer":23,"createTime":5,"id":24,"options":25,"question":28,"source":20,"type":29},[],1096665162,[26,27],"对","错","日常使用的手机采用的是交流供电",3,{"answer":31,"createTime":5,"id":32,"options":33,"question":38,"source":20,"type":39},[],1096665166,[34,35,36,37],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5f4be89f05d4fef6b5f378741045aebc.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2fefff8626bc2324dadf9e0a2b64b28e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F99b4d4f5044e44cabf109da0cc5222d6.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2454b35d9ced1048369bee7a61f1fddf.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F217ac0488a1bd58736560a994f62f254.png\">",1,{"answer":41,"createTime":5,"id":42,"options":43,"question":48,"source":20,"type":21},[],1096665175,[44,45,46,47],"向着长直导线平移","离开长直导线平移","转动","不动","如图所示:无限长直载流导线与正三角形载流线圈在同一平面内,若长直导线固定不动,则载流三角形线圈将\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe7e33c2d48478a867bbd9e1c71f8b210.PNG\">",{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":20,"type":21},[],1096665191,[53,54,55,56],"电势的正负决定于试探电荷的正负","电势的正负决定于移动试探电荷时外力对试探电荷做功的正负","空间某点电势的正负是不确定的, 可正可负, 决定于电势零点的选取","电势的正负决定于带电体的正负","下面关于某点电势正负的陈述中, 正确的是()",{"answer":59,"createTime":5,"id":60,"options":61,"question":62,"source":20,"type":29},[],1096665218,[26,27],"电场中某处电场强度的大小等于该处电势的梯度大小,方向为电势下降最快的方向",{"answer":64,"createTime":5,"id":65,"options":66,"question":71,"source":20,"type":39},[],1096665222,[67,68,69,70],"导体中的电场强度处处为零","导体表面处的电场强度方向处处平行","导体整个是一个等势体,且等于表面的电势","导体内部存在净电荷","处于静电平衡状态的导体具有的特性有()",{"answer":73,"createTime":5,"id":74,"options":75,"question":76,"source":20,"type":29},[],1096665225,[26,27],"电磁波也是波动过程,也需要波源和弹性媒质的存在才可以传播",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":20,"type":21},[],1096665227,[81,82,83,84],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7b0a680e05aff5253036154b49cd6d63.PNG\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd25166fb345031132897efba61e4aacd.PNG\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffcb1a19f966e48282a90b5464450b547.PNG\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F27029c9a6df345981b997d3cc2a7ef75.PNG\">","有一边长为a的正方形平面,在其中垂线上距中心O点a\u002F2处,有一电荷为q的正点电荷,如图所示,则通过该平面的电场强度通量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb04c3977c18efd367e31bf75cd0fcc9c.PNG\">",{"answer":87,"createTime":5,"id":88,"options":89,"question":94,"source":20,"type":39},[],1096665236,[90,91,92,93],"电场力不作功,两电荷电势能不变","电场力作的总功为QEL\u002F2,两电荷的电势能减小","电场力作的总功为-QEL\u002F2,两电荷的电势能增加","电场力做总功大小跟转轴位置无关","如图,绝缘杆长L,两端分别带有等量异号电荷,电量值为Q,处在场强为E的匀强电场中,杆与电场线夹角α=60°,若使杆沿顺时针转过60°(以杆上某一点为圆心转动),下述正确的是()\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe3c0381151937a72863be596da573f9e.png\">"]