一条长为L的绝缘细线上端固定,下段拴一质量为m的带电小球,将它置于水平向右的匀强电场中,场强为E,已知当细线与竖直方向的夹角为b时,小球处于平衡位置A点,问在平衡位置以多大的速度 Va
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![一条长为L的绝缘细线上端固定,下段拴一质量为m的带电小球,将它置于水平向右的匀强电场中,场强为E,已知当细线与竖直方向的夹角为b时,小球处于平衡位置A点,问在平衡位置以多大的速度 Va](/uploads/image/z/6357700-28-0.jpg?t=%E4%B8%80%E6%9D%A1%E9%95%BF%E4%B8%BAL%E7%9A%84%E7%BB%9D%E7%BC%98%E7%BB%86%E7%BA%BF%E4%B8%8A%E7%AB%AF%E5%9B%BA%E5%AE%9A%2C%E4%B8%8B%E6%AE%B5%E6%8B%B4%E4%B8%80%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E5%B8%A6%E7%94%B5%E5%B0%8F%E7%90%83%2C%E5%B0%86%E5%AE%83%E7%BD%AE%E4%BA%8E%E6%B0%B4%E5%B9%B3%E5%90%91%E5%8F%B3%E7%9A%84%E5%8C%80%E5%BC%BA%E7%94%B5%E5%9C%BA%E4%B8%AD%2C%E5%9C%BA%E5%BC%BA%E4%B8%BAE%2C%E5%B7%B2%E7%9F%A5%E5%BD%93%E7%BB%86%E7%BA%BF%E4%B8%8E%E7%AB%96%E7%9B%B4%E6%96%B9%E5%90%91%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BAb%E6%97%B6%2C%E5%B0%8F%E7%90%83%E5%A4%84%E4%BA%8E%E5%B9%B3%E8%A1%A1%E4%BD%8D%E7%BD%AEA%E7%82%B9%2C%E9%97%AE%E5%9C%A8%E5%B9%B3%E8%A1%A1%E4%BD%8D%E7%BD%AE%E4%BB%A5%E5%A4%9A%E5%A4%A7%E7%9A%84%E9%80%9F%E5%BA%A6+Va)
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