如图所示,一个质量为m=0.03kg,带电量为q=-1.0×10^-8C的带电小球用绝缘细线悬挂在某水平方向的匀强电场中,图中实线为电场线.当小球静止时,测得悬线与竖直方向成30°角.若改变所加电场的方向,
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![如图所示,一个质量为m=0.03kg,带电量为q=-1.0×10^-8C的带电小球用绝缘细线悬挂在某水平方向的匀强电场中,图中实线为电场线.当小球静止时,测得悬线与竖直方向成30°角.若改变所加电场的方向,](/uploads/image/z/4368336-24-6.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%B8%80%E4%B8%AA%E8%B4%A8%E9%87%8F%E4%B8%BAm%3D0.03kg%2C%E5%B8%A6%E7%94%B5%E9%87%8F%E4%B8%BAq%3D-1.0%C3%9710%5E-8C%E7%9A%84%E5%B8%A6%E7%94%B5%E5%B0%8F%E7%90%83%E7%94%A8%E7%BB%9D%E7%BC%98%E7%BB%86%E7%BA%BF%E6%82%AC%E6%8C%82%E5%9C%A8%E6%9F%90%E6%B0%B4%E5%B9%B3%E6%96%B9%E5%90%91%E7%9A%84%E5%8C%80%E5%BC%BA%E7%94%B5%E5%9C%BA%E4%B8%AD%2C%E5%9B%BE%E4%B8%AD%E5%AE%9E%E7%BA%BF%E4%B8%BA%E7%94%B5%E5%9C%BA%E7%BA%BF.%E5%BD%93%E5%B0%8F%E7%90%83%E9%9D%99%E6%AD%A2%E6%97%B6%2C%E6%B5%8B%E5%BE%97%E6%82%AC%E7%BA%BF%E4%B8%8E%E7%AB%96%E7%9B%B4%E6%96%B9%E5%90%91%E6%88%9030%C2%B0%E8%A7%92.%E8%8B%A5%E6%94%B9%E5%8F%98%E6%89%80%E5%8A%A0%E7%94%B5%E5%9C%BA%E7%9A%84%E6%96%B9%E5%90%91%2C)
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