本题目来源于试卷: Electricity and Circuits: Resistor，类别为 美国物理杯赛(Physics Bowl)
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05.16: A cylindrical graphite resistortw rn1ezurp0-a5av3; has l*yqqv9x 32qa)1 hdcbk ength L 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 resistivity to the old resistivity of the x3qqd1yqbv 2)9kh ca *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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