(08静电场)17 重电复合场中作圆周运动(原卷)
【重电复合场中作圆周运动】1、如图所示,水平向左的匀强电场场强大小为E,一根不可伸长的绝缘细线长度为l,细线一端拴一个质量为m、电荷量为q的带负电小球,另一端固定在O点。把小球拉到使细线水平的位置A,然后由静止释放,小球沿弧线运动到细线与水平方向夹角θ=60°的位置B时速度为零。以下说法中正确的是( )A.A点电势低于B点电势B.小球受到的电场力与重力的关系是Eq=mgC.小球在B点时,细线拉力为2mgD.小球从A运动到B过程中,电场力对其做的功为Eql2、如图所示,一质量为m、带电荷量为q的小球,用绝缘细线悬挂在水平向右的匀强电场中,假设电场区域足够大,静止时悬线向左与竖直方向成60°角。...
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