Physics (AS & A Level) · May / June 2018 · Paper 11 · Question 19

Two wires, one made of brass and the other of steel, are stretched in an experiment. Both wires obey Hooke's law during this experiment. The Young modulus for brass is less than the Young modulus for steel. Which graph shows how the stress varies with strain for both wires in this experiment?

1. AGraph A: stress against strain, both curves non-linear; steel curve above brass curve
2. BGraph B: stress against strain, both straight lines through origin; steel line steeper than brass line
3. CGraph C: stress against strain, both curves non-linear; brass curve above steel curve
4. DGraph D: stress against strain, both straight lines through origin; brass line steeper than steel line

As printed in the paper