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calculate the eletrostatic energy of a point charge with +Q surrounded by a sphere of uniformly distributed volume charge with a radius R and a total charge of -Q. 如果算式不好寫的話 可以請大概解釋一下如何算嗎? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.114.206.124