.Resistor. (id: 6b859cbb4)

本题目来源于试卷: .Resistor.，类别为 美国物理杯赛(Physics Bowl)

[单选题]
98.20: Wire I and wire 7oiaxo*+iqwzi q:ra l*3 03e l jkj8m-cj7dn +II are gbp0e5 ty+ hmc4gaa+/made of the same material. Wire II has twice the diameter and twice the length of I. If I has ha4g p5+g+/bey0ta cmresistance R, II has resistance

A. $R/8$
B. $R/4$
C. $R/2$
D. $R$
E. $2R$


参考答案:  C


本题详细解析: 暂无

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