本题目来源于试卷: Physics Unit18: Electric Currents，类别为 国际高中通用物理
[单选题]
The diameter of a copp y 1g akgwh.c/cot/g27c ilr+-er wire is 0.081 inch. The maximum safe current it c,nb.h3;o u xgsan carry (in order to prevent fire danger in building construction) is 20 A.xs g;nuho,.3 b At this current, what is the drift velocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)
A. 0.044 mm/s
B. 0.44 mm/s
C. 0.44 cm/s
D. 0.44 m/s
参考答案: B
本题详细解析:
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