Physics

Problem

Two straight wires are to be used in a laboratory circuit. • Wire P: copper, length

2\,\text{m}

, diameter

0.50\,\text{mm}

• Wire Q: nichrome, length

1.5\,\text{m}

, diameter

0.25\,\text{mm}

Take

\rho_{\text{Cu}} = 1.7 \times 10^{-8}\,\Omega\text{m}

and

\rho_{\text{NiCr}} = 1.1 \times 10^{-6}\,\Omega\text{m}

. Which wire offers the greater electrical resistance? a) Wire P only b) Both wires have nearly equal resistance c) Wire Q only d) Cannot be decided with the given data

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