如图所示,AB和CD是两根固定且平行的水平光滑金属导轨,符号“×”表示垂直于纸面指向纸面里的磁场的磁感线.现将铜棒EF和GH垂直放在滑轨上,并与金属导轨接触良好;当外力拉动GH使其向左
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![如图所示,AB和CD是两根固定且平行的水平光滑金属导轨,符号“×”表示垂直于纸面指向纸面里的磁场的磁感线.现将铜棒EF和GH垂直放在滑轨上,并与金属导轨接触良好;当外力拉动GH使其向左](/uploads/image/z/10214015-23-5.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CAB%E5%92%8CCD%E6%98%AF%E4%B8%A4%E6%A0%B9%E5%9B%BA%E5%AE%9A%E4%B8%94%E5%B9%B3%E8%A1%8C%E7%9A%84%E6%B0%B4%E5%B9%B3%E5%85%89%E6%BB%91%E9%87%91%E5%B1%9E%E5%AF%BC%E8%BD%A8%2C%E7%AC%A6%E5%8F%B7%E2%80%9C%C3%97%E2%80%9D%E8%A1%A8%E7%A4%BA%E5%9E%82%E7%9B%B4%E4%BA%8E%E7%BA%B8%E9%9D%A2%E6%8C%87%E5%90%91%E7%BA%B8%E9%9D%A2%E9%87%8C%E7%9A%84%E7%A3%81%E5%9C%BA%E7%9A%84%E7%A3%81%E6%84%9F%E7%BA%BF%EF%BC%8E%E7%8E%B0%E5%B0%86%E9%93%9C%E6%A3%92EF%E5%92%8CGH%E5%9E%82%E7%9B%B4%E6%94%BE%E5%9C%A8%E6%BB%91%E8%BD%A8%E4%B8%8A%2C%E5%B9%B6%E4%B8%8E%E9%87%91%E5%B1%9E%E5%AF%BC%E8%BD%A8%E6%8E%A5%E8%A7%A6%E8%89%AF%E5%A5%BD%EF%BC%9B%E5%BD%93%E5%A4%96%E5%8A%9B%E6%8B%89%E5%8A%A8GH%E4%BD%BF%E5%85%B6%E5%90%91%E5%B7%A6)
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