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Physics (AS & A Level) · May / June 2026 · Paper 12 · Question 33

9702Resistance and resistivity

A metal wire with circular cross-section has length L and diameter d. The resistance of the wire is R. The wire is now melted and reformed into a new wire of diameter 0.50d. The volume of the wire is unchanged. What is the resistance of the new wire?

  1. AR
  2. B2R
  3. C4R
  4. D16R

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Correct answer: D. 16R

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