[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fvSkSljY6G7E8-USN7yUJww_bzyt71W-Z6r4XpNh59ik":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-05 15:04:19",17850771,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fae159a7eba0d4d22bfec1fa65779932d.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F162cd14a2e7f86fbc5a3ed87f80592c7.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9f51b3d1ae55c6b577bf2c4522dc9ffe.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa50640f66adf93899aa17a1583a93017.png\">",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},20,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","3d2e602d075a4249a9ea56248615a228","第九章 静电场中的电介质单元测试","如图所示,将一个电荷量为Q的点电荷放在一个半径为R的不带电的导体球附近,点电荷距离导体球球心为2R,设无穷远处电势为零,则在导体球球心O点有\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcec3001739292b28c6019cea3714ae3d.png\">",[21,32,42,51,60,69,79,89,92,102],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],17850764,[25,26,27,28],"2C","3C\u002F2","C","C\u002F3","如图,一空气平行板电容器,极板间距为d,电容为C.若在两板中间平行地插入一块厚度为d\u002F3的金属板,则其电容值变为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Faa65b5f8b82f63eedcd348549f2c44ba.png\">","v1",0,{"answer":33,"createTime":34,"id":35,"options":36,"question":41,"source":30,"type":31},[],"2023-05-19 11:02:55",17850765,[37,38,39,40],"εrW0","W0\u002Fεr","(1+W0)\u002Fεr","W0","一空气平行板电容器,充电后把电源断开,这时电容器中储存的能量为W0.然后在两极板之间充满相对介电常数为εr的各向性均匀电介质,则该电容器中储存的能量 W为",{"answer":43,"createTime":5,"id":44,"options":45,"question":50,"source":30,"type":31},[],17850766,[46,47,48,49],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff1ca43dcfa1f418c720674f4a5dfa044.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0167bb407152211240475037e783657c.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4126975615bc0d3d5ef44dbb62944dfa.png\">","0","如图所示,一个不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处的电势为:\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F64ec076fa0b2864f824710e6398a4c99.png\">",{"answer":52,"createTime":34,"id":53,"options":54,"question":59,"source":30,"type":31},[],17850767,[55,56,57,58],"σ\u002F2,-σ\u002F2","-σ\u002F2,σ\u002F2","σ,-σ","-σ,σ","如图,一无限大均匀带电平面A附近放置一与之平行的无限大导体平板B.已知带电平面A的电荷面密度为σ,则导体板B两表面1和2的感应电荷面密度分别为σ1=________,和σ2=_____________.\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F44442d6ca444529bc7836df30399d81b.png\">",{"answer":61,"createTime":34,"id":62,"options":63,"question":68,"source":30,"type":31},[],17850768,[64,65,66,67],"若高斯面内不包围自由电荷,则穿过高斯面的D通量与E通量均为零","若高斯面上的 D 处处为零,则面内自由电荷的代数和必为零","高斯面上各点D 处由面内自由电荷决定","穿过高斯面的D 通量与面内自由电荷有关,而穿过高斯面的E 通量与高斯面内的自由电荷和束缚电荷均有关","(静电场中电介质)关于有介质时的高斯定理,下列说法中正确的是",{"answer":70,"createTime":71,"id":72,"options":73,"question":78,"source":30,"type":31},[],"2025-11-07 02:53:33",17850769,[74,75,76,77],"电场强度Ea>Eb,电场力作正功","电势Va<Vb,电场力作负功","电势能Wa<Wb,电场力作正功","电势能Wa<Wb,电场力作负功","(静电场 功)空间某区域静电场的电场线分布如图、所示,现将电量为-q的点电荷由a点经任意路径移到b点,则在下列说法中,正确的是: \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc28a8d92dfd74c8b64864ba09ef8641f.png\">",{"answer":80,"createTime":81,"id":82,"options":83,"question":88,"source":30,"type":31},[],"2025-12-02 05:03:47",17850770,[84,85,86,87],"上面带正电,下面带负电","不带电","带正电","带负电","如图,一导体球壳 A,同心地罩在一接地导体B 上,今给球壳A 带负电−Q,则B 球\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7a242d926e14ac05743931752adaea80.png\">",{"answer":90,"createTime":5,"id":6,"options":91,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":93,"createTime":94,"id":95,"options":96,"question":101,"source":30,"type":31},[],"2025-12-05 15:02:17",17850772,[97,98,99,100],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F108e137e91973311d7b5b50a5da400d7.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F244a8fe59e38094f142ddf55c136e0a8.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9c813798183f2fab59f247a02de4a7cc.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F47fd7cb7924dd0adeb152035a46ff6fc.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F12f5327f844d0eec07283a467a9d8265.png\">",{"answer":103,"createTime":71,"id":104,"options":105,"question":110,"source":30,"type":31},[],17850773,[106,107,108,109],"Q\u002F2S;Q\u002FS","-Q\u002FS;-Q\u002FS","-Q\u002F2S;-Q\u002FS","Q\u002F2S;-Q\u002FS","如图,面积均为S的两金属平板A,B平行对称放置,间距远小于金属平板的长和宽,今给A板带电Q,B板不接地和B板接地时,B板内侧的感应电荷的面密度分别为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa41f966dfdcda0cced2ad322ac3c4cbf.png\">"]