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Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 34

9702Resistance and resistivity

Four wires are made of the same metal. The cross-sectional areas, lengths and thermodynamic temperatures of the wires are shown. Which wire has the largest resistance?

  1. Across-sectional area A, length 2L, temperature 2T
  2. Bcross-sectional area A, length L, temperature T
  3. Ccross-sectional area 2A, length 2L, temperature 2T
  4. Dcross-sectional area 2A, length L, temperature T

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Correct answer: A. cross-sectional area A, length 2L, temperature 2T

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