一根粗细均匀的导线，两端加上电压u时，通过导线中的电流强度为i，若将导线均匀拉长，使它的横截面半径变为原来的三分之一，再给它两端加上电压u，则（ Sketch Coloring Page

一根粗细均匀的导线，两端加上电压u时，通过导线中的电流强度为i，若将导线均匀拉长，使它的横截面半径变为原来的三分之一，再给它两端加上电压u，则（ Template

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tomski一根粗细均匀的导线，两端加上电压u时，通过导线中的电流强度为i，若将导线均匀拉长，使它的横截面半径变为原来的三分之一，再给它两端加上电压u，则（ coloring

一根粗细均匀的导线，两端加上电压U时，通过导线中的电流强度为I，若将导线均匀拉长，使它的横截面半径变为原来的三分之一，再给它两端加上电压U，则（ sketch template

有一根粗细不均匀的导线己知粗细端横截面积之比为21当有电流通过这一导线时通过粗端的电流I粗与通过细端的电流I细的关系是 A．I粗 sketch template

一根圆柱状导体加上电压U后导体中电流为I若将导体均匀拉长至截面积半径为原来的再加上电压U求此时的电流 题目和参考答案——青夏教育精英 sketch template

如图一圈粗细均匀的导线长s在两端点AB间加上恒定电压时测得通过导线的电流为IA如剪去BC段在AC两端加同样电压时通过导线的电流 sketch template

如图所示，一根半径为R的无限长直铜导线，载有电流I，电流均匀分布在导线的横截面上。在导线内部通过中心轴作一横切面S，则通过横切面S上每单位长度 sketch template

小徐同学利用导体甲和导体乙各一个电流表一只电流表一只�动变阻器一个电键一个电源和若干导线探究通过导体中的电流与导体两端电压的关系 sketch template

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�学家�现两根平行导线通电后有如图所示的现象图中实线虚线分别表示通电前后的情况．1由图可知两平行通电导线之间有力的作用．当通入的 sketch template

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如图所示方�水平的匀强磁场B中一根粗细均匀的通电导体置于水平桌面上电流方�与磁场方�垂直．此时导体对桌面有压力．要使导体对桌面的压力为 sketch template

如图所示将一根粗细均匀的电阻丝弯成一上闭合的圆环接入电路中电路与圆环的O点固定P为与圆环良好接触的�动头闭合开关S在�动头P缓慢地 sketch template

在一个导体两端加上3V的电压时通过电流是02A此时导体的电阻是 Ω若在它的两端加上45V的电压这里导体的电阻是 Ω——青夏教育 sketch template

一根粗细均匀的�属导线其电阻值为R将其剪成相等的两段后再进行并联则并联后的电阻值为 A 2R B R C D 题目和参考答案 sketch template

如图所示把一根包有绝缘层的导线绕在铁钉上把导线两端的绝缘层刮去接上干电池后铁钉 A有磁性 B会熔化 C有电流流过 D两端 sketch template

小明取一根粗细均匀的饮料吸管在其下端塞入适量�属丝并用石蜡封口制成简易密度计．现使吸管竖直漂浮在不同液体中测量出液面到吸管下端的深度为h sketch template

利用图甲电路测量某电池的内阻其中AB为一段粗细均匀的铅笔芯笔芯上套有一�属�环P宽度和电阻不计与笔芯良好接触并可只有移动．实验器材 sketch template

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一根粗细均匀阻值为8Ω的电阻丝在温度不变的情况下先将它等分成四段每段电阻为再将这四段电阻丝并联并联后总电阻为则与的大小依次为A sketch template

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