A-LevelPhysicsDeformation of solids9702/12 · Feb/Mar 2016 · Q191 Mark

The Young modulus of steel is twice that of copper. A 50 cm length of copper wire of diameter 2.0 mm is joined to a 50 cm length of steel wire of diameter 1.0 mm, making a combination wire of length 1.0 m, as shown. [Figure 19.1] The combination wire is stretched by a weight added to its end. Both the copper and the steel wires obey Hooke's law. What is the ratio (extension of steel wire)/(extension of copper wire)?

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D0.5

✓ Correct answer

B: 2

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Topic: Deformation of solids, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2016 Paper 1 Variant 2, question 19.

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