CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1 · Question Q3

A current of 0.25\text{ A} flows in a uniform wire of length 2\text{ metre} and cross-sectional area 2 \times 10^{-9}\text{ m}^2, when the potential difference across the wire is 4.25\text{ V}. What is the resistivity of the material from which the wire is made?

1. (A)5.9 \times 10^{-11}\ \Omega\text{m}
2. (B)4.25 \times 10^{-9}\ \Omega\text{m}
3. (C)1.7 \times 10^{-8}\ \Omega\text{m}
4. (D)3.4 \times 10^{-8}\ \Omega\text{m}