$A$ negligibly small current is passed through a wire of length $15 \ m$ and uniform cross-section $6 \times 10^{-7} \ m^2$,and its resistance is measured to be $5 \ \Omega$. The resistivity of the material at the temperature of the experiment is . . . . . . $\Omega \ m$.
- A$2 \times 10^7$
- B$3 \times 10^{-7}$
- C$2 \times 10^{-7}$
- D$3 \times 10^{+7}$
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