如图所示,A为竖直放置的圆形金属板,半径为r,带有电荷量为Q的正电荷,小球质量为m,电荷量为q,半径可忽略,用绝缘丝线悬挂于O点,小球静止时候与金属板的圆心等高,且相距3r,悬线偏离竖直方向
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![如图所示,A为竖直放置的圆形金属板,半径为r,带有电荷量为Q的正电荷,小球质量为m,电荷量为q,半径可忽略,用绝缘丝线悬挂于O点,小球静止时候与金属板的圆心等高,且相距3r,悬线偏离竖直方向](/uploads/image/z/8300600-8-0.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CA%E4%B8%BA%E7%AB%96%E7%9B%B4%E6%94%BE%E7%BD%AE%E7%9A%84%E5%9C%86%E5%BD%A2%E9%87%91%E5%B1%9E%E6%9D%BF%2C%E5%8D%8A%E5%BE%84%E4%B8%BAr%2C%E5%B8%A6%E6%9C%89%E7%94%B5%E8%8D%B7%E9%87%8F%E4%B8%BAQ%E7%9A%84%E6%AD%A3%E7%94%B5%E8%8D%B7%2C%E5%B0%8F%E7%90%83%E8%B4%A8%E9%87%8F%E4%B8%BAm%2C%E7%94%B5%E8%8D%B7%E9%87%8F%E4%B8%BAq%2C%E5%8D%8A%E5%BE%84%E5%8F%AF%E5%BF%BD%E7%95%A5%2C%E7%94%A8%E7%BB%9D%E7%BC%98%E4%B8%9D%E7%BA%BF%E6%82%AC%E6%8C%82%E4%BA%8EO%E7%82%B9%2C%E5%B0%8F%E7%90%83%E9%9D%99%E6%AD%A2%E6%97%B6%E5%80%99%E4%B8%8E%E9%87%91%E5%B1%9E%E6%9D%BF%E7%9A%84%E5%9C%86%E5%BF%83%E7%AD%89%E9%AB%98%2C%E4%B8%94%E7%9B%B8%E8%B7%9D3r%2C%E6%82%AC%E7%BA%BF%E5%81%8F%E7%A6%BB%E7%AB%96%E7%9B%B4%E6%96%B9%E5%90%91)
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