阿摩線上測驗
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試卷名稱：114年 - 114 國立中興大學_學士後醫學系招生考試_學士後醫學系：物理#126484
年份：114年
科目：學士後西醫-物理
34.We find that N current loops are coplanar and coaxial. The first has radius a and current I. The second has radius 2a and current 2I, and the pattern is repeated up to the Nth, which has radius Na and current NI. The current in each loop is counterclockwise as seen from above. The magnitude of the magnetic field at the center of the loops is
(A) µ0I / 2Na
(B) µ0I / Na
(C) µ0I /2a
(D) µ0NI / 2a
(E) µ0NI / a
