A negligibly small current is passed through a wire of length $15\;cm$ and uniform cross section wire of length $6.0 \times 10^{-7}\;m^2$ and its resistance is measured to be $5.0 \Omega$ What is the resistivity of the material at the temperature of the experiment ?

Question

$\begin{array}{1 1} 2.0 \times 10^{-7}\;\Omega \;m \\7.0 \times 10^{-7}\;\Omega \;m \\ 8.0 \times 10^{-7}\;\Omega \;m \\ 3.0 \times 10^{-7}\;\Omega \;m\end{array} $