A-LevelPhysicsDeformation of solidsFeb/Mar 2016Paper 1 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 \frac{\text{extension of steel wire}}{\text{extension of copper wire}}?
A4
B2
C1
D0.5
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The correct answer is B. This question tests the candidate's understanding of deformation of solids within the Physicssyllabus. The examiner's mark scheme requires...
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