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原题.(第20届物理竞赛预赛第7题)图1中,A和B是真空中的两块面积很大的平行金属板,加上周期为T的交流电压,在两板间产生交变的匀强电场.已知B板电势为0,A板电势UA随时间变化的规律如图2所示,其中UA的最大值为U0,最小值为-2U0,在图1中,虚线MN表示
(The 20th physical competition preliminaries question 7) In Figure 1, A and B is a vacuum in the two large parallel plates, with a period of AC voltage T, the two plates produce cross Change uniform electric field.B plate potential is known as 0, A plate potential UA with time as shown in Figure 2, where the maximum UA U0, the minimum is -2U0, in Figure 1, the dotted line MN Said