本题目来源于试卷: .Resistor.，类别为 美国物理杯赛(Physics Bowl)
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05.16: A cylindrical graphite resp 5f 1w/sh:9kfi;jsi wistor has length Leb01c 6:e0 wpd( n zt0pugwuk2 and cross-sectional area A. It is to be placed into a circuit, but it first must be cut in half so that the new length is 1/2 L. What is the ratio of the new resistivityed0e0 pn6p:12ww tckub(0gz u to the old resistivity of the cylindrical resistor?
A. 4
B. 2
C. 1
D. 1/2
E. 1/4
参考答案: C
本题详细解析:
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