电流大小与导线横截面积的关系是什么样的？ 知乎 Sketch Coloring Page

电流大小与导线横截面积的关系是什么样的？ 知乎 Template

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tomski电流大小与导线横截面积的关系是什么样的？ 知乎 coloring

电流大小与导线横截面积的关系是什么样的？ 知乎 sketch template

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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