两根电阻忽略不计的相同金属直角导轨相距为l,它们各有一边在同一水平面内,另一边垂直于水平面,且都足够长,两金属杆ab,cd与导轨垂直接触形成闭合回路,杆与导轨之间的动摩擦因数均为u,且
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![两根电阻忽略不计的相同金属直角导轨相距为l,它们各有一边在同一水平面内,另一边垂直于水平面,且都足够长,两金属杆ab,cd与导轨垂直接触形成闭合回路,杆与导轨之间的动摩擦因数均为u,且](/uploads/image/z/13793029-61-9.jpg?t=%E4%B8%A4%E6%A0%B9%E7%94%B5%E9%98%BB%E5%BF%BD%E7%95%A5%E4%B8%8D%E8%AE%A1%E7%9A%84%E7%9B%B8%E5%90%8C%E9%87%91%E5%B1%9E%E7%9B%B4%E8%A7%92%E5%AF%BC%E8%BD%A8%E7%9B%B8%E8%B7%9D%E4%B8%BAl%2C%E5%AE%83%E4%BB%AC%E5%90%84%E6%9C%89%E4%B8%80%E8%BE%B9%E5%9C%A8%E5%90%8C%E4%B8%80%E6%B0%B4%E5%B9%B3%E9%9D%A2%E5%86%85%2C%E5%8F%A6%E4%B8%80%E8%BE%B9%E5%9E%82%E7%9B%B4%E4%BA%8E%E6%B0%B4%E5%B9%B3%E9%9D%A2%2C%E4%B8%94%E9%83%BD%E8%B6%B3%E5%A4%9F%E9%95%BF%2C%E4%B8%A4%E9%87%91%E5%B1%9E%E6%9D%86ab%2Ccd%E4%B8%8E%E5%AF%BC%E8%BD%A8%E5%9E%82%E7%9B%B4%E6%8E%A5%E8%A7%A6%E5%BD%A2%E6%88%90%E9%97%AD%E5%90%88%E5%9B%9E%E8%B7%AF%2C%E6%9D%86%E4%B8%8E%E5%AF%BC%E8%BD%A8%E4%B9%8B%E9%97%B4%E7%9A%84%E5%8A%A8%E6%91%A9%E6%93%A6%E5%9B%A0%E6%95%B0%E5%9D%87%E4%B8%BAu%2C%E4%B8%94)
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