Resistance and Resistivity: A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 ? across its ends. What is the resistivity of the material from which this rod is made?
A. 0.023 ? ? m
B. 0.015 ? ? m
C. 1.5 × 10-4 ? ? m
D. 2.3 × 10-6 ? ? m
Answer: D
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