如图,金属棒ab置于水平放置的U形光滑导轨上,在ef右侧存在有界匀强磁场B,磁场方向垂直导轨平面向下,在ef左侧的无磁场区域cdef内有一半径很小的金属圆环L,圆环与导轨在同一平面内.当金属
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![如图,金属棒ab置于水平放置的U形光滑导轨上,在ef右侧存在有界匀强磁场B,磁场方向垂直导轨平面向下,在ef左侧的无磁场区域cdef内有一半径很小的金属圆环L,圆环与导轨在同一平面内.当金属](/uploads/image/z/6265090-10-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E9%87%91%E5%B1%9E%E6%A3%92ab%E7%BD%AE%E4%BA%8E%E6%B0%B4%E5%B9%B3%E6%94%BE%E7%BD%AE%E7%9A%84U%E5%BD%A2%E5%85%89%E6%BB%91%E5%AF%BC%E8%BD%A8%E4%B8%8A%2C%E5%9C%A8ef%E5%8F%B3%E4%BE%A7%E5%AD%98%E5%9C%A8%E6%9C%89%E7%95%8C%E5%8C%80%E5%BC%BA%E7%A3%81%E5%9C%BAB%2C%E7%A3%81%E5%9C%BA%E6%96%B9%E5%90%91%E5%9E%82%E7%9B%B4%E5%AF%BC%E8%BD%A8%E5%B9%B3%E9%9D%A2%E5%90%91%E4%B8%8B%2C%E5%9C%A8ef%E5%B7%A6%E4%BE%A7%E7%9A%84%E6%97%A0%E7%A3%81%E5%9C%BA%E5%8C%BA%E5%9F%9Fcdef%E5%86%85%E6%9C%89%E4%B8%80%E5%8D%8A%E5%BE%84%E5%BE%88%E5%B0%8F%E7%9A%84%E9%87%91%E5%B1%9E%E5%9C%86%E7%8E%AFL%2C%E5%9C%86%E7%8E%AF%E4%B8%8E%E5%AF%BC%E8%BD%A8%E5%9C%A8%E5%90%8C%E4%B8%80%E5%B9%B3%E9%9D%A2%E5%86%85%EF%BC%8E%E5%BD%93%E9%87%91%E5%B1%9E)
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