A-LevelPhysicsD.C. circuits9702/12 · May/June 2013 · Q351 Mark

Two wires P and Q made of the same material are connected to the same electrical supply. P has twice the length of Q and one-third of the diameter of Q, as shown in the diagram. [Figure showing two wires P and Q connected in a circuit, with lengths and diameters labeled] current in P What is the ratio ? current in Q

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A2/3

B2/9

C1/6

D1/18

✓ Correct answer

D: 1/18

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2013 Paper 1 Variant 2, question 35.

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