某静电场中的电场线如图所示带电粒子在电场中仅受电场力作用其运动轨迹如图中虚线所示由m运动到n以下说法正确的是 A.粒子必定带正电荷 Template




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tomski某静电场中的电场线如图所示带电粒子在电场中仅受电场力作用其运动轨迹如图中虚线所示由m运动到n以下说法正确的是 a.粒子必定带正电荷 coloring