Answer: infinity.
- A infinity
- B zero
- C exactly one
- D a negative value
Correct answer: A. infinity
Explanation: A perfectly rigid body cannot be deformed, so its Young’s modulus is infinite.
A typical stress-strain curve: the initial straight line (Hooke's Law region, slope = Young's modulus) ends at the elastic limit; beyond the yield point, deformation becomes permanent, peaking at the ultimate tensile strength before the wire finally fractures.
Concept context
Stress, strain, Hookes law, and the elastic moduli that describe how solids deform and recover under load.