A $1.0 - \mathrm { mm }$ Diameter Extension Cord Is Made of Metal Having a Resistivity

A $1.0 - \mathrm { mm }$ diameter extension cord is made of metal having a resistivity of $1.68 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m }$ . When it carries a current of $15 \mathrm {~A}$ , what is the potential difference between two points in the cord that are $100 \mathrm {~m}$ apart?

A) $41 \mathrm {~V}$
B) $32 \mathrm {~V}$
C) $23 \mathrm {~V}$
D) $12 \mathrm {~V}$

Correct Answer:

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