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一根铝线的截面积为0.10mm 2 ,在室温300K时通有5.0×10 -4 A的电流.设每个铝原子有三个电子参与导电,已知铝的相对原子质量为27,室温时的密度为2.7g/cm 3 ,电阻率为2.8×10 -6 Ω·m,电子质量m e =9.1×10 -31 kg,阿伏伽德罗常量为6.0×10 23 mol -1 ,玻耳兹曼常量k=1.38×10 -23 J/K.求铝线内
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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