[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fnmmkb08k_qhP3-jMI6ld2Ccuhugl_LBYPkSMbiS7-ws":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-10-30 05:39:17",225859376,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0b73a71164868250ff7dc03d83cda9cd.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8d09b20bf2f1aa82f3ca8b3a4ffd7b3e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F60d8dc6e380501933ef5c1f6ab87ca42.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fda8464cf5dddfae6b3bcd50419640f65.png\">",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},73,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_47457181","大学物理作业一(电磁学和光学)","如图3所示,一个带电量为q的点电荷位于一边长为l的正方形abcd的中心线上,q距正方形l\u002F2,则通过该正方形的电场强度通量大小等于:()\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0e920a9a0f4b44e250b4203a901b8b7f.png\">",[21,32,35,44,53,62,70,79,88,97],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],225859375,[25,26,27,28],"大小为零","大小为q\u002F(2pe0a2), 方向沿x轴正向","大小为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F179cd1cddca1ae1b4b8f10006b4ab82e.png\">, 方向沿y轴正向","大小为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3ee4548b33246e05e581d6ae3e307d85.png\">, 方向沿y轴负向","边长为a的正方形的四个顶点上放置如图2所示的点电荷,则中心O处场强()\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F131b82dbc5c116758d8471269fa219e4.png\">","v1",0,{"answer":33,"createTime":5,"id":6,"options":34,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":30,"type":31},[],225859377,[39,40,41,42],"处处为零","不一定都为零","处处不为零","无法判定","一均匀带电球面,电荷面密度为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9b7f52611b651fea49e31db88b4edf1b.png\">,球面内电场强度处处为零,球面上面元\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd1e8ad7764e85bed285352695c86a892.png\">的一个带电量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F68af4011fc7042a0ee8808cdec3a27a5.png\">的电荷元,在球面内各点产生的电场强度",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],225859378,[48,49,50,51],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7c642034550a8e72f83305f341d5a42e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F151c7233e37a1d957a9e934de0981898.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc2ff158bbced286bc62187054560088e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe68407901b40ebc2520ee4d974e8e116.png\">","如图5所示,两个同心的均匀带电球面,内球半径为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa9e23b701ac796a639adb12c588033dc.png\">,带电量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff8e67ec4c76d5225052011c8edfd831d.png\">;外球面半径为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F71bee605448dd4b52c1a700773e82021.png\">,带电量为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff34d697a51a200a53fd93182d3b4b5ed.png\">.设无穷远处为电势零点,则在外球面外面,距离球心为r处的P点的电势为:[ ]\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2429a95a28e945e3cfce4b7f8a2672f1.png\">",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],225859379,[57,58,59,60],"场强为零的点,电势也一定为零","场强不为零的点,电势也一定不为零","电势为零的点,场强也一定为零","电势在某一区域内为常量,则该区域的场强一定为零","下列说法正确的是[ ]",{"answer":63,"createTime":5,"id":64,"options":65,"question":61,"source":30,"type":31},[],225859380,[66,67,68,69],"等势面上各点的电场强度的大小一定相等","在电势高处,电势能也一定高","电场强度大处,电势也一定高","电场强度的方向总是从电势高处指向电势低处",{"answer":71,"createTime":5,"id":72,"options":73,"question":78,"source":30,"type":31},[],225859381,[74,75,76,77],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa62b69ddacea8836d98446d7ff32f9d2.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcfbbeff24b70002cb4aa45e05637c9bc.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd35264a050a693dcd5f1929a0524c389.png\">","因空腔形状不是球形,两者无法比较","在一个原来不带电的外表面为球形的空腔导体A内,放有一带电量为+Q的带电导体B,如图8所示,则比较空腔导体A的电势UA和导体B的电势UB时,可得以下结论:[ ]\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F43fcd5c61ea4ca8959719683f8dcd378.png\">",{"answer":80,"createTime":5,"id":81,"options":82,"question":87,"source":30,"type":31},[],225859382,[83,84,85,86],"0","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F19a31df04e57fd5df31d33f8adfabb75.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F20e7a08c6cdc4cc3fac14d51fc82dede.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb2dd5185852b1bb89e6e1e5bd9a008b0.png\">","如图9,一个未带电的空腔导体球壳内半径为R.在腔内离球心的距离为d处 (d < R) 固定一电量为+q的点电荷,用导线把球壳接地后,再把地线撤去,选无穷远处为电势零点,则球心O处电势为 [ ]\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1c5f8d14940d6fd45f48a6e8fe846bdc.png\">",{"answer":89,"createTime":5,"id":90,"options":91,"question":96,"source":30,"type":31},[],225859383,[92,93,94,95],"s1 = -s , s2 = +s","s1 = -s\u002F2 , s2 = +s\u002F2","s1 = -s , s2 = 0","s1 = -s\u002F2 , s2 = -s \u002F2","一"无限大"均匀带电平面A,其附近放一与它平行的有一定厚度的"无限大"平面导体板B,如图10所示.已知A上的电荷面密度为s,则在导体板B的两个表面1和2上的感应电荷面密度为:[ ]\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F659f5b41b45ed29d566fa965b771a1c8.png\">",{"answer":98,"createTime":5,"id":99,"options":100,"question":105,"source":30,"type":31},[],225859384,[101,102,103,104],"d1\u002Fd2","1","d2\u002Fd1","d22\u002Fd12","三块互相平行的导体板,相互之间的距离d1和d2比板面积线度小得多,外面两板用导线连接.中间板上带电,设左右两面上电荷面密度分别为s1和s2,如图11所示.则比值s1\u002Fs2为 [ ]\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F45a9a32bebaaca7eacbf5fc59c1ba0aa.png\">"]