空间有一匀强电场电场方�与纸面平行.一带电量为 Q的小球在恒定拉力f的作用下沿虚线由m匀速运动到n如图所示.已知力f和mn间夹角为θ Template




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tomski空间有一匀强电场电场方�与纸面平行.一带电量为 q的小球在恒定拉力f的作用下沿虚线由m匀速运动到n如图所示.已知力f和mn间夹角为θ coloring