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 DC motor of internal resb 7 bve dc 0t/ jkd1n;z:rd9ujvpa0wp rs:14i4d/mogoe q0pg58 p6r+1ktai-2kdh. s histance 6.0 W is connected to a 24-V power supply. The operating current ipk 06h+a8./-o 1gdeds5 it qpgrm 2okhs 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?
A. $6.0 \; V$
B. $9.0 \; V$
C. $18 \; V$
D. $24 \; V$
参考答案: B
本题详细解析:
暂无
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