An aluminium wire carrying a current has diameter

PHYSICS · Multi-part · A Level · Physics · Electricity · Electricity

Problem

0.84\,\mathrm{mm}

. The electric field in the wire is

0.49\,\mathrm{V\,m^{-1}}

. The specific resistance of aluminium is

2.75\times10^{-8}\,\Omega\cdot\mathrm{m}

. What is: (1) The current carried by the wire? (2) The potential difference between two points in the wire

12.0\,\mathrm{m}

apart? (3) The resistance of a

12.0\,\mathrm{m}

length of this wire?