A cylindrical wire of length and diameter has a measured resistance of at

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A cylindrical wire of length

0.500\,\text{m}

and diameter

0.80\,\text{mm}

has a measured resistance of

0.013\,\Omega

20\,^\circ\text{C}

. Based on the resistivities shown below, which material is the wire MOST likely made of? Material-Resistivity (

\Omega\cdot\text{m}

20\,^\circ\text{C}

) (a) Nichrome,

1.10\times10^{-6}\,\Omega\cdot\text{m}

(b) Aluminum,

2.82\times10^{-8}\,\Omega\cdot\text{m}

1.68\times10^{-8}\,\Omega\cdot\text{m}

(d) Constantan,

4.90\times10^{-7}\,\Omega\cdot\text{m}