Resistance and Resistivity: The resistivity of a 1.0 m long copper wire is 1.72 × 10-8 ? ? m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A. 17 mV
B. 0.90 mV
C. 1.7 mV
D. 10 mV
E. 90 mV
Answer: C
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