A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2012 · Q341 Mark

The graph shows the variation with length l of resistance R for two wires X and Y made from the same material. [Figure showing R-l graph for wires X and Y] What does the graph show?

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Across-sectional area of X = 2 × cross-sectional area of Y

Bresistivity of X = 2 × resistivity of Y

Cwhen equal lengths of X and Y are connected in series to a battery, power in X = 2 × power in Y

Dwhen equal lengths of X and Y are connected in parallel to a battery, current in X = 2 × current in Y

✓ Correct answer

C: when equal lengths of X and Y are connected in series to a battery, power in X = 2 × power in Y

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2012 Paper 1 Variant 2, question 34.

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