A-LevelPhysicsElectricityFeb/Mar 2017Paper 1 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
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The correct answer is A. This question tests the candidate's understanding of electricity within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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