本题目来源于试卷: Physics Unit21: Electromagnetic Induction & Faraday's Law，类别为 通用国际物理
[单选题]
A circular loop of wivbgd , ra2: 5bg:tme0ork* x:ere is rotated at constant angular speed about an axi7pn lv1 n-lr ;*ccfbain71k;ps whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotatio; r7*lpp1v-a 1n;cn nflbi kc7n if the induced $emf$ is to be zero?
A. Any horizontal orientation will do.
B. It must make an angle of $45^{\circ}$ to the vertical.
C. It must be vertical.
D. none of the given answers
参考答案: C
本题详细解析:
暂无
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