February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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34Resistance ResistivityHard1 mark
Conducting putty is a substance that conducts electricity and can be moulded into various shapes. A cuboid made from this putty has length and width . The resistance between the square faces of the cuboid is .
cuboid of conducting putty with length L between its two square end faces and side x marked on the square cross-section
Some more of the putty is moulded into a cylinder that has length . The resistance between the circular faces of the cylinder is also . What is the radius of the cylinder?