如图所示,MPQO为有界的竖直向下的匀强电场,电场强度为E,ACB为光滑固定的半圆形轨道,圆轨道半径为R,AB为圆水平直径的两个端点,AC为圆弧.一个质量为m电荷量为 -q的带电小球,从A点正上方高为H
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![如图所示,MPQO为有界的竖直向下的匀强电场,电场强度为E,ACB为光滑固定的半圆形轨道,圆轨道半径为R,AB为圆水平直径的两个端点,AC为圆弧.一个质量为m电荷量为 -q的带电小球,从A点正上方高为H](/uploads/image/z/9891031-31-1.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CMPQO%E4%B8%BA%E6%9C%89%E7%95%8C%E7%9A%84%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8B%E7%9A%84%E5%8C%80%E5%BC%BA%E7%94%B5%E5%9C%BA%2C%E7%94%B5%E5%9C%BA%E5%BC%BA%E5%BA%A6%E4%B8%BAE%2CACB%E4%B8%BA%E5%85%89%E6%BB%91%E5%9B%BA%E5%AE%9A%E7%9A%84%E5%8D%8A%E5%9C%86%E5%BD%A2%E8%BD%A8%E9%81%93%2C%E5%9C%86%E8%BD%A8%E9%81%93%E5%8D%8A%E5%BE%84%E4%B8%BAR%2CAB%E4%B8%BA%E5%9C%86%E6%B0%B4%E5%B9%B3%E7%9B%B4%E5%BE%84%E7%9A%84%E4%B8%A4%E4%B8%AA%E7%AB%AF%E7%82%B9%2CAC%E4%B8%BA%E5%9C%86%E5%BC%A7.%E4%B8%80%E4%B8%AA%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%94%B5%E8%8D%B7%E9%87%8F%E4%B8%BA+-q%E7%9A%84%E5%B8%A6%E7%94%B5%E5%B0%8F%E7%90%83%2C%E4%BB%8EA%E7%82%B9%E6%AD%A3%E4%B8%8A%E6%96%B9%E9%AB%98%E4%B8%BAH)
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