20、如图所示,AC、BD为一边长为d的正方形ABCD的两条对角线.空间存在一与正方形所在平面平行的未知静电场.现有一带电量为+q的点电荷,先从A点运动到B点,电势能减少了E;又从B点运动到C点,
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![20、如图所示,AC、BD为一边长为d的正方形ABCD的两条对角线.空间存在一与正方形所在平面平行的未知静电场.现有一带电量为+q的点电荷,先从A点运动到B点,电势能减少了E;又从B点运动到C点,](/uploads/image/z/4606730-26-0.jpg?t=20%E3%80%81%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CAC%E3%80%81BD%E4%B8%BA%E4%B8%80%E8%BE%B9%E9%95%BF%E4%B8%BAd%E7%9A%84%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%AF%B9%E8%A7%92%E7%BA%BF.%E7%A9%BA%E9%97%B4%E5%AD%98%E5%9C%A8%E4%B8%80%E4%B8%8E%E6%AD%A3%E6%96%B9%E5%BD%A2%E6%89%80%E5%9C%A8%E5%B9%B3%E9%9D%A2%E5%B9%B3%E8%A1%8C%E7%9A%84%E6%9C%AA%E7%9F%A5%E9%9D%99%E7%94%B5%E5%9C%BA.%E7%8E%B0%E6%9C%89%E4%B8%80%E5%B8%A6%E7%94%B5%E9%87%8F%E4%B8%BA%EF%BC%8Bq%E7%9A%84%E7%82%B9%E7%94%B5%E8%8D%B7%2C%E5%85%88%E4%BB%8EA%E7%82%B9%E8%BF%90%E5%8A%A8%E5%88%B0B%E7%82%B9%2C%E7%94%B5%E5%8A%BF%E8%83%BD%E5%87%8F%E5%B0%91%E4%BA%86E%EF%BC%9B%E5%8F%88%E4%BB%8EB%E7%82%B9%E8%BF%90%E5%8A%A8%E5%88%B0C%E7%82%B9%2C)
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