本题目来源于试卷: Physics Unit18: Electric Currents，类别为 通用国际物理
[单选题]
The diameter of a copper wire is 0.081 inch. /4bdyw1uh2t: .l/ yq)olxs4oh xd0zwThe m(04w( uqlvoeu) bvs. eaximum 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 ofsewv).l 4u((euvb 0 oq 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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