A copper wire of length 80 cm and cross-sectional area has resistance

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

Problem

A copper wire of length 80 cm and cross-sectional area 0.20 mm20.20\,\text{mm}^2 has resistance RR. Which length of copper wire of cross-sectional area 0.40 mm20.40\,\text{mm}^2 has resistance RR? (A) 10 cm (B) 20 cm (C) 40 cm (D) 160 cm

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