阿摩線上測驗
13. When a ductile metal wire is stretched to N times its original length (without changing its density and resistivity), the resistance R will change by a factor of
(A) 1/N2；
(B) 1/N；
(C) N；
(D) N2；
(E) None.
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統計： A(0), B(1), C(1), D(0), E(0) #3188044
統計： A(0), B(1), C(1), D(0), E(0) #3188044
