A-LevelPhysicsElectricity9702/12 · Feb/Mar 2017 · Q341 Mark

A coil contains N turns of insulated copper wire wound on to a cylindrical iron core of diameter D. The copper wire has a diameter d. The resistivity of copper is ρ. Diameter D is much greater than diameter d. What is the total resistance between the two ends of the coil?

A4NρD d²

B4Nρd D²

C8NρD d²

D8Nρd D²

✓ Correct answer

A: 4NρD d²

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2017 Paper 1 Variant 2, question 34.

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