$A$ wire $50\, cm$ long and $1\, mm^2$ in cross-section carries a current of $4\, A$ when connected to a $2\, V$ battery. The resistivity of the wire is:
- A$1 \times 10^{-6}\, \Omega\cdot m$
- B$4 \times 10^{-6}\, \Omega\cdot m$
- C$5 \times 10^{-7}\, \Omega\cdot m$
- D$2 \times 10^{-7}\, \Omega\cdot m$
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