如图所示,电源电动势为E内阻为r,外电路中O点接地,当滑动变阻器的划片向右移动,则a,b两点的电势变化?
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![如图所示,电源电动势为E内阻为r,外电路中O点接地,当滑动变阻器的划片向右移动,则a,b两点的电势变化?](/uploads/image/z/13107291-51-1.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8A%A8%E5%8A%BF%E4%B8%BAE%E5%86%85%E9%98%BB%E4%B8%BAr%2C%E5%A4%96%E7%94%B5%E8%B7%AF%E4%B8%ADO%E7%82%B9%E6%8E%A5%E5%9C%B0%2C%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84%E5%88%92%E7%89%87%E5%90%91%E5%8F%B3%E7%A7%BB%E5%8A%A8%2C%E5%88%99a%2Cb%E4%B8%A4%E7%82%B9%E7%9A%84%E7%94%B5%E5%8A%BF%E5%8F%98%E5%8C%96%3F)
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