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