一道八年级物理题,请好好看看.本人物理不太好,快开学了,请赶快.我把问题打上来:如图所示电路,电源电压不变.闭合开关S,当滑片P置于变阻器的中点时,电压表的示数为4V;当滑片P置于变阻
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![一道八年级物理题,请好好看看.本人物理不太好,快开学了,请赶快.我把问题打上来:如图所示电路,电源电压不变.闭合开关S,当滑片P置于变阻器的中点时,电压表的示数为4V;当滑片P置于变阻](/uploads/image/z/11910400-16-0.jpg?t=%E4%B8%80%E9%81%93%E5%85%AB%E5%B9%B4%E7%BA%A7%E7%89%A9%E7%90%86%E9%A2%98%2C%E8%AF%B7%E5%A5%BD%E5%A5%BD%E7%9C%8B%E7%9C%8B.%E6%9C%AC%E4%BA%BA%E7%89%A9%E7%90%86%E4%B8%8D%E5%A4%AA%E5%A5%BD%2C%E5%BF%AB%E5%BC%80%E5%AD%A6%E4%BA%86%2C%E8%AF%B7%E8%B5%B6%E5%BF%AB.%E6%88%91%E6%8A%8A%E9%97%AE%E9%A2%98%E6%89%93%E4%B8%8A%E6%9D%A5%EF%BC%9A%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%94%B5%E8%B7%AF%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%B8%8D%E5%8F%98.%E9%97%AD%E5%90%88%E5%BC%80%E5%85%B3S%2C%E5%BD%93%E6%BB%91%E7%89%87P%E7%BD%AE%E4%BA%8E%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84%E4%B8%AD%E7%82%B9%E6%97%B6%2C%E7%94%B5%E5%8E%8B%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA4V%EF%BC%9B%E5%BD%93%E6%BB%91%E7%89%87P%E7%BD%AE%E4%BA%8E%E5%8F%98%E9%98%BB)
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