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試卷名稱：114年 - [無官方正解]114 國立中山大學_碩士班招生考試試題_物理系：普通物理#137736
年份：114年
科目：研究所、轉學考(插大)◆普通物理學
20. Four identical positive point charges (each having the same charge q) are initially at rest and infinitely separated. An amount of work is required to move these point charges to the four corners of a square with edge length L. Suppose there are three charges already positioned as shown in Figure 6. Calculate the work needed to bring.the fourth charge to point D. We define 
(A) (4+√2)a
(B)
(C)
(D) (2+√2)α