The Resistance of A $100 - \mathrm { cm }$ Wire of Cross Sectional Area

Multiple Choice

The resistance of a $100 - \mathrm { cm }$ wire of cross sectional area $2 \times 10 ^ { - 6 } \mathrm {~m} ^ { 2 }$ is $400 \Omega$ . What is the resistivity of the material from which this wire is made?

A) $0.80 \times 10 ^ { - 5 } \Omega \cdot \mathrm { m }$
B) $0.80 \times 10 ^ { - 6 } \Omega \cdot \mathrm { m }$
C) $8.0 \times 10 ^ { - 4 } \Omega \cdot \mathrm { m }$
D) $8.0 \times 10 ^ { - 6 } \Omega \mathrm { V }$
E) $0.80 \times 10 ^ { - 4 } \Omega \cdot \mathrm { m }$