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

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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

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

将一根铜导线接在电路中要使导线电阻变大下列说法正确的是 A．将铜导线对折后接入电路B．增大导线两端的电压或增大电流C．用长度横截面积 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

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

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

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

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