Resistance and Resistivity: A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is 1.68 × 10-8 ? ? m.
A. 0.67 V
B. 0.34 V
C. 0.067 V
D. 0.034 V
Answer: C
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