Physics (AS & A Level) · May / June 2020 · Paper 22 · Question 5

One end of a wire is attached to a fixed point. A force F is applied to the wire to cause extension x. The variation with F of x is shown in Fig. 5.1. 0 0 0.1 0.2 0.3 0.4 0.5 0.6 5 10 15 20 F / N x / mm 25 30 35 40 45 Fig. 5.1 The wire has a cross-sectional area of 4.1 × 10–7 m2 and is made of metal of Young modulus 1.7 × 1011 Pa. Assume that the cross-sectional area of the wire remains constant as the wire extends.

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