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【单选题】
一个平行板电容器水平放置,两极板间的一半空间充有各向同性均匀电介质,另一半为空气,如图。当两极板带上恒定的等量异号电荷时,有一个质量为 m 、带电荷为 + q 的质点,在极板间的空气区域中处于平衡。此后,若把电介质抽去,则该质点A.
保持不动
B.
向上运动
C.
向下运动
D.
是否运动不能确定
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