Question

A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.

Hint:

Always convert area from \(\text{mm}^2\) to \(\text{m}^2\) before using \[ \rho=\frac{RA}{L}. \] Remember: \[ 1\,\text{mm}^2=10^{-6}\,\text{m}^2. \]

Answer 1