如图,光滑平行金属导轨相距30cm,电阻不计.ab是电阻为0.3Ω的金属棒,可沿导轨滑动,与导轨相连的平行金属板A、B相距6cm,电阻R为0.1Ω.全部装置处于垂直纸面向里的匀强磁场中,当ab以速度v 向右匀
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![如图,光滑平行金属导轨相距30cm,电阻不计.ab是电阻为0.3Ω的金属棒,可沿导轨滑动,与导轨相连的平行金属板A、B相距6cm,电阻R为0.1Ω.全部装置处于垂直纸面向里的匀强磁场中,当ab以速度v 向右匀](/uploads/image/z/14780649-57-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%85%89%E6%BB%91%E5%B9%B3%E8%A1%8C%E9%87%91%E5%B1%9E%E5%AF%BC%E8%BD%A8%E7%9B%B8%E8%B7%9D30cm%2C%E7%94%B5%E9%98%BB%E4%B8%8D%E8%AE%A1.ab%E6%98%AF%E7%94%B5%E9%98%BB%E4%B8%BA0.3%CE%A9%E7%9A%84%E9%87%91%E5%B1%9E%E6%A3%92%2C%E5%8F%AF%E6%B2%BF%E5%AF%BC%E8%BD%A8%E6%BB%91%E5%8A%A8%2C%E4%B8%8E%E5%AF%BC%E8%BD%A8%E7%9B%B8%E8%BF%9E%E7%9A%84%E5%B9%B3%E8%A1%8C%E9%87%91%E5%B1%9E%E6%9D%BFA%E3%80%81B%E7%9B%B8%E8%B7%9D6cm%2C%E7%94%B5%E9%98%BBR%E4%B8%BA0.1%CE%A9.%E5%85%A8%E9%83%A8%E8%A3%85%E7%BD%AE%E5%A4%84%E4%BA%8E%E5%9E%82%E7%9B%B4%E7%BA%B8%E9%9D%A2%E5%90%91%E9%87%8C%E7%9A%84%E5%8C%80%E5%BC%BA%E7%A3%81%E5%9C%BA%E4%B8%AD%2C%E5%BD%93ab%E4%BB%A5%E9%80%9F%E5%BA%A6v+%E5%90%91%E5%8F%B3%E5%8C%80)
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