一根粗细均匀的电阻丝总电阻为24Ω,现将它围成一个半径为r的圆环,并将它放在两根平行放置并相距为r的裸铜线上,两裸铜线的一端分别与电压为3V的电源、电流表和开关相串联,如图所示.裸
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![一根粗细均匀的电阻丝总电阻为24Ω,现将它围成一个半径为r的圆环,并将它放在两根平行放置并相距为r的裸铜线上,两裸铜线的一端分别与电压为3V的电源、电流表和开关相串联,如图所示.裸](/uploads/image/z/3287452-4-2.jpg?t=%E4%B8%80%E6%A0%B9%E7%B2%97%E7%BB%86%E5%9D%87%E5%8C%80%E7%9A%84%E7%94%B5%E9%98%BB%E4%B8%9D%E6%80%BB%E7%94%B5%E9%98%BB%E4%B8%BA24%CE%A9%2C%E7%8E%B0%E5%B0%86%E5%AE%83%E5%9B%B4%E6%88%90%E4%B8%80%E4%B8%AA%E5%8D%8A%E5%BE%84%E4%B8%BAr%E7%9A%84%E5%9C%86%E7%8E%AF%2C%E5%B9%B6%E5%B0%86%E5%AE%83%E6%94%BE%E5%9C%A8%E4%B8%A4%E6%A0%B9%E5%B9%B3%E8%A1%8C%E6%94%BE%E7%BD%AE%E5%B9%B6%E7%9B%B8%E8%B7%9D%E4%B8%BAr%E7%9A%84%E8%A3%B8%E9%93%9C%E7%BA%BF%E4%B8%8A%2C%E4%B8%A4%E8%A3%B8%E9%93%9C%E7%BA%BF%E7%9A%84%E4%B8%80%E7%AB%AF%E5%88%86%E5%88%AB%E4%B8%8E%E7%94%B5%E5%8E%8B%E4%B8%BA3V%E7%9A%84%E7%94%B5%E6%BA%90%E3%80%81%E7%94%B5%E6%B5%81%E8%A1%A8%E5%92%8C%E5%BC%80%E5%85%B3%E7%9B%B8%E4%B8%B2%E8%81%94%2C%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%EF%BC%8E%E8%A3%B8)
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