Physics (AS & A Level) · May / June 2018 · Paper 13 · Question 18

Data for a steel wire on an electric guitar are listed. diameter = 5.0 × 10–4 m Young modulus = 2.0 × 1011 Pa tension = 20 N The wire snaps and contracts elastically. Assume the wire obeys Hooke’s law. By what percentage does the length l of a piece of the wire contract?

1. A1.3 × 10–4 %
2. B5.1 × 10–4 %
3. C1.3 × 10–2 %
4. D5.1 × 10–2 %

As printed in the paper