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]
The cross-sectional area of an adjustable single 4 61x n4wzaqqhloop ih5mj c ar6+seq haf+g(6xc:.ps reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?
A. $5 \; V$
B. $10 \; V$
C. $15 \; V$
D. $20 \; V$
参考答案: B
本题详细解析:
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