A long copper wire is to be made into a resistor

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

A

2.0\,\text{m}

long copper wire is to be made into a

3\,\Omega

resistor. The resistivity of copper is

1.7\times10^{-8}\,\Omega\,\text{m}

. Calculate the diameter of the wire that should be chosen. (Take

\pi = 3.14

.)

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