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 copper wire is 0k3 m-ln vw-+yajzny-8yl2 yu..081 inch. Tcdz)s/eub m6), oph8c he maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electrons? (The number o,8 mpc cuh dbse)z/6o)f 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:
暂无
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