The Resistivity of A $1.0 \mathrm {~m}$ Long Copper Wire Is $1.72 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m }$

The resistivity of a $1.0 \mathrm {~m}$ long copper wire is $1.72 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m }$ and its cross sectional area is $2.0 \times$ $10 ^ { - 6 } \mathrm {~m} ^ { 2 }$ . If the wire carries a current of $0.20 \mathrm {~A}$ , what is the voltage across the wire?

A) $1.7 \mathrm { mV }$
B) $17 \mathrm { mV }$
C) $0.90 \mathrm { mV }$
D) $90 \mathrm { mV }$
E) $10 \mathrm { mV }$

Correct Answer:

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