如图所示半径为r的圆环均匀带电单位长度的电荷量为λ圆心在o点过圆心与环面垂直的轴线上有p点po=r.以无穷远为电势零点则关于p点的 Template




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tomski如图所示半径为r的圆环均匀带电单位长度的电荷量为λ圆心在o点过圆心与环面垂直的轴线上有p点po=r.以无穷远为电势零点则关于p点的 coloring