有关功能关系如图12-3-19所示,a、b是同种材料(非超导材料)制成的等长导体棒,静止于水平面内足够长的光滑水平导轨上,b的质量是a的2倍,匀强磁场垂直于纸面向里.若给a以 4.5 J的初动能使之向
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![有关功能关系如图12-3-19所示,a、b是同种材料(非超导材料)制成的等长导体棒,静止于水平面内足够长的光滑水平导轨上,b的质量是a的2倍,匀强磁场垂直于纸面向里.若给a以 4.5 J的初动能使之向](/uploads/image/z/2172902-14-2.jpg?t=%E6%9C%89%E5%85%B3%E5%8A%9F%E8%83%BD%E5%85%B3%E7%B3%BB%E5%A6%82%E5%9B%BE12-3-19%E6%89%80%E7%A4%BA%2Ca%E3%80%81b%E6%98%AF%E5%90%8C%E7%A7%8D%E6%9D%90%E6%96%99%28%E9%9D%9E%E8%B6%85%E5%AF%BC%E6%9D%90%E6%96%99%29%E5%88%B6%E6%88%90%E7%9A%84%E7%AD%89%E9%95%BF%E5%AF%BC%E4%BD%93%E6%A3%92%2C%E9%9D%99%E6%AD%A2%E4%BA%8E%E6%B0%B4%E5%B9%B3%E9%9D%A2%E5%86%85%E8%B6%B3%E5%A4%9F%E9%95%BF%E7%9A%84%E5%85%89%E6%BB%91%E6%B0%B4%E5%B9%B3%E5%AF%BC%E8%BD%A8%E4%B8%8A%2Cb%E7%9A%84%E8%B4%A8%E9%87%8F%E6%98%AFa%E7%9A%842%E5%80%8D%2C%E5%8C%80%E5%BC%BA%E7%A3%81%E5%9C%BA%E5%9E%82%E7%9B%B4%E4%BA%8E%E7%BA%B8%E9%9D%A2%E5%90%91%E9%87%8C.%E8%8B%A5%E7%BB%99a%E4%BB%A5+4.5+J%E7%9A%84%E5%88%9D%E5%8A%A8%E8%83%BD%E4%BD%BF%E4%B9%8B%E5%90%91)
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