A piece of wire has a length of 0.80 m and a diameter of $5.0 \times {10^{ - 4}}$ m. The I–V characteristic of the wire is shown.
What is the resistivity of the metal from which the wire is made?

1 )
$1.2 \times {10^{ - 7}}\Omega m$
2 )
$1.6 \times {10^{ - 7}}\Omega m$
$4.9 \times {10^{ - 7}}\Omega m$
4 )
$2.0 \times {10^{ - 7}}\Omega m$
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