The graph plots stress against strain for three wires that have identical linear dimensions but are made of different materials. Which statements are correct? 1. The extension of P is roughly double that of Q for the same stress. 2. The ratio of the Young modulus of P to that of Q is roughly two. 3. For strain less than $0.1$, R obeys Hooke’s law.
- A1, 2 and 3
- B1 and 3 only
- C2 and 3 only
- D2 only