May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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33Resistance ResistivityMedium1 mark
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?