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        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 square coil of wir kx95 410qcy izj 8jhqmu4aj.se with 155kfpj7wko5, /pg 9w hz turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T.  The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s.  What is the magnitude of the average induced $emf$?
 
 
 
A. $6.0 \; V$ B. $36 \; V$
 C. $45 \; V$
 D. $90 \; V$
 
 
 参考答案:  D
 
 
 本题详细解析:
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