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Physics · Oct / Nov 2017 · Paper 12 · Question 30

5054Resistance

A piece of wire has a resistance of 16 Ω. The wire is 20 cm long and has a cross-sectional area of 2.0 mm². Which wire of the same material has a resistance of 8.0 Ω?

  1. Alength / cm: 10; cross-sectional area / mm²: 1.0
  2. Blength / cm: 10; cross-sectional area / mm²: 4.0
  3. Clength / cm: 20; cross-sectional area / mm²: 1.0
  4. Dlength / cm: 20; cross-sectional area / mm²: 4.0

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Correct answer: D. length / cm: 20; cross-sectional area / mm²: 4.0

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