Two straight wires are to be used in a laboratory circuit

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

Problem

Two straight wires are to be used in a laboratory circuit. • Wire P: copper, length 2 m2\,\text{m}, diameter 0.50 mm0.50\,\text{mm} • Wire Q: nichrome, length 1.5 m1.5\,\text{m}, diameter 0.25 mm0.25\,\text{mm} Take ρCu=1.7×10−8 Ωm\rho_{\text{Cu}} = 1.7 \times 10^{-8}\,\Omega\text{m} and ρNiCr=1.1×10−6 Ωm\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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