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Physics (AS & A Level) · Oct / Nov 2025 · Paper 13 · Question 36

9702Resistance and resistivity

Two identical wires X and Y, each of length L and radius r, are connected in parallel as shown. The total resistance of this combination is R1. Wire X is replaced with a wire of the same material with length L and radius 2r. The total resistance of the new combination is R2. What is the ratio R1/R2?

  1. A2/5
  2. B2/3
  3. C3/2
  4. D5/2

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Correct answer: D. 5/2

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