A Metal Bar Is $20 \mathrm {~cm}$ Long and Has a Rectangular Cross-Section Measuring

A metal bar is $20 \mathrm {~cm}$ long and has a rectangular cross-section measuring $1.0 \mathrm {~cm} \times 2.0 \mathrm {~cm}$ . What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is $1.68 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m }$ .

A) $0.034 \mathrm {~V}$
B) $0.67 \mathrm {~V}$
C) $0.067 \mathrm {~V}$
D) $0.34 \mathrm {~V}$

Correct Answer:

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