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

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

12．粗细均匀的直导线ab的两端悬挂在两 根相同的弹簧下边ab恰好处在水平位置．已知ab的质量为m＝10 G长度L＝60 Cm沿水平 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

题目abcd是一个用粗细均匀的电阻丝围成的正方形单匝线框边长为L每边电阻为R匀强磁场与线框面垂直如图所示磁感应强度大小为B线框 sketch template

有一根粗细均匀的�属电阻线．1用螺旋测微器测直径时示数如图1所示读数为 Mm．2其电阻Rx可用如图2甲所示的电路测量．所给器材中 sketch template

初中生如何理解电生磁？知乎 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

题目如图所示将一根电阻为R的绝缘硬�属导线弯成一个标准的正弦曲线形状其两端ab通过小�属环保持与长直�属杆有着良好但无�擦的接触 sketch template

如图所示质量为mA=2kg的物块A静止在倾角为37°的斜面底端由跨过光�小定�轮的轻绳与质量为mB=3kg的物块B相连轻绳拉直时用手托住 sketch template

如图甲所示用粗细均匀的电阻丝折成平面三角形框架置于光�水平面上三边的长度分别为3L4L和5L长度为L的电阻丝的电阻为r框架与一电动势 sketch template

如图所示两根导线沿半径方�引�铁环上的两点并在很远处与电源相连。已知圆环的粗细均匀求环中心的磁感应强度。百度教育 sketch template

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22．如右图所示在磁场中悬挂一根直导线导线的两端分别连接在电流表的两个接线柱上组成一个闭合电路当导线沿着图示方�运动时有两个运动方� sketch template

如图甲将一根粗细均匀的木棒放在水平地面上稍微抬起一端至�用力100N则木棒的重力约是 N．图乙则是一根粗细不均匀的木棒若稍微抬起一端 sketch template

如图所示用两根相同的细绳水平悬挂一段均匀载流直导线MN电流I方�从M到N绳子的拉力均为F为使F＝0可能达到要求的方法是 A．加 sketch template

一段粗细均匀的电阻丝电阻值为16Ω将它围成一个封闭的圆圈如图所示则AB两点间的电阻为3Ω．为探究串联电路电压规律小敏将该段电阻丝分成 sketch template

题目某研究性学习小组设计了一种测定风力的装置其原理如图甲所示．迎风板与一轻质弹簧一端相连穿在光�的�属杆上弹簧由绝缘材料制成均匀 sketch template

题目一粗细均匀的U形管ABCD的A端封闭D端与大气相通．用水银将一定质量的理想气体封闭在U形管的AB一侧并将两端�下竖直放置如图所示 sketch template

如图甲所示条形磁铁放在水平桌面上在其左上方固定一根长直导线导线与磁铁垂直给导线通以垂直纸面�里的电流用FN表示磁铁对桌面的压力f sketch template

电源连接电容器一极，电容器另一端不连导线，这时电容器上有电压吗知乎 sketch template

某段导体两端的电压是12V通过它的电流是3A则它的电阻为 Ω若这段导体两端电压为0V则通过它的电流为 A它的阻值是 ΩA．36 sketch template

某研究性学习小组设计了一种测定风力的装置其原理如图1所示．迎风板与一轻质弹簧一端连接穿在光�的�属杆上弹簧由绝缘材料制成均匀�属杆的 sketch template

如图所示将一根粗细均匀的电阻丝弯成一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缓慢地由 sketch template

当一根直导线在磁场中做切割磁感线运动时A．导线两端可能产生感生电压 B．导线两端必定产生感生电压 C．导线中一定有感生电流产生 D．感生电压和 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

如今合肥一中的每间教室里都有饮水机纯净水的质量关乎每一名学生的身体健康．纯净水质量是否合格的一项重要指标是它的电导率λ是否超标电导率λ即 sketch template

在某一温度下连接在电路中的两段导体A和B中的电流与其两端电压的关系如图所示由图中信息可知CA．A导体的电阻为10ΩB．A导体的电阻大于B 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

高中物理通电导线在磁场中受到的力 电流 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

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

3．有一根粗细均匀两端封闭的玻璃管管内封闭着空气被一段水银柱分为A和B两部分现将AB两段空气柱同时降低相同的温度若把玻璃管与水平面成 sketch template

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