.如图所示,匀强磁场的磁感应强度为B,方向竖直向下,在磁场中有一边长为L的正方形导线框,ab边质量为m其余边质量不计,cd边有固定的水平轴,导线框可以绕其转动,现将导线框拉至水平位
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![.如图所示,匀强磁场的磁感应强度为B,方向竖直向下,在磁场中有一边长为L的正方形导线框,ab边质量为m其余边质量不计,cd边有固定的水平轴,导线框可以绕其转动,现将导线框拉至水平位](/uploads/image/z/8311808-56-8.jpg?t=%EF%BC%8E%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%8C%80%E5%BC%BA%E7%A3%81%E5%9C%BA%E7%9A%84%E7%A3%81%E6%84%9F%E5%BA%94%E5%BC%BA%E5%BA%A6%E4%B8%BAB%2C%E6%96%B9%E5%90%91%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8B%2C%E5%9C%A8%E7%A3%81%E5%9C%BA%E4%B8%AD%E6%9C%89%E4%B8%80%E8%BE%B9%E9%95%BF%E4%B8%BAL%E7%9A%84%E6%AD%A3%E6%96%B9%E5%BD%A2%E5%AF%BC%E7%BA%BF%E6%A1%86%2Cab%E8%BE%B9%E8%B4%A8%E9%87%8F%E4%B8%BAm%E5%85%B6%E4%BD%99%E8%BE%B9%E8%B4%A8%E9%87%8F%E4%B8%8D%E8%AE%A1%EF%BC%8Ccd%E8%BE%B9%E6%9C%89%E5%9B%BA%E5%AE%9A%E7%9A%84%E6%B0%B4%E5%B9%B3%E8%BD%B4%EF%BC%8C%E5%AF%BC%E7%BA%BF%E6%A1%86%E5%8F%AF%E4%BB%A5%E7%BB%95%E5%85%B6%E8%BD%AC%E5%8A%A8%EF%BC%8C%E7%8E%B0%E5%B0%86%E5%AF%BC%E7%BA%BF%E6%A1%86%E6%8B%89%E8%87%B3%E6%B0%B4%E5%B9%B3%E4%BD%8D)
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