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試卷名稱：111年 - 111 臺灣綜合大學系統_學士班轉學生聯合招生考試：普通物理C#125313
年份：111年
科目：研究所、轉學考(插大)◆普通物理學
15. Two long solenoids (radii 20 mm and 30 mm respectively) carry the same amount of current. The smaller solenoid is mounted inside the larger, along a common axis. It is observed that there is zero magnetic field within the inner solenoid. Therefore, the inner solenoid must have X times as many turns per length as the outer solenoid where X is:
(A) 4/9
(B) 2/3
(C) 3/2
(D) 1
(E) 9/4.
