A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to when mass M is suspended from its free end. The expression for Young's modulus is:
When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L+l). The elastic potential energy stored in the extended wire is:
The stress-strain curves are drawn for two different materials X and Y. It is observed that the ultimate strength point and the fracture point are close to each other for material X but are far apart for material Y. We can say that the materials X and Y are likely to be: (respectively)
1. ductile and brittle.
2. brittle and ductile.
3. brittle and plastic.
4. plastic and ductile.