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試卷名稱：91年 - 91 學士後西醫：物理#85626
年份：91年
科目：學士後西醫-物理
2.An imaginary closed surface S of radius R is centered on the origin. A positive charge is originally at the
origin, and the flux through hte surface is 
. The positive charge is slowly moved from the origin to a
point R/2 away from the origin. Now the flux is .
(A) 
(B)
(C) 
(D) 
(E) 