試卷名稱:112年 - 112 國立中興大學_學士後醫學系招生考試_學士後醫學系甲、乙組:物理#113978
年份:112年
科目:學士後西醫-物理
43. The figure shows a 2.0-cm diameter roller that turns at 90 rpm. A 4.0-cm wide plastic film is being wrapped onto the roller, and this plastic carries an excess electric charge having a uniform surface charge density of 5.0 nC/cm2. What is the current of the moving film?
(A) 190 nA
(B) 23 μA
(C) 30 nA
(D) 11 μA
(E) 16 nA.