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  4. Figure shows stress/strain curves for three different materials taken to ‘fracture’.Which curve best shows the behaviour of a copper wire, and which one best shows the behaviour of a ‘glass fibre’? <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/19ff69512736dd698cf2dc3a49de6b2d-.png /> (a) (b) (c) (d) Copper wire I II III II Glass fibre II III III I

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Q. Figure shows stress/strain curves for three different materials taken to ‘fracture’.Which curve best shows the behaviour of a copper wire, and which one best shows the behaviour of a ‘glass fibre’?
image
(a) (b) (c) (d)
Copper wire I II III II
Glass fibre II III III I

Mechanical Properties of Solids

Solution:

Glass is brittle, so the strain produced at fracture is very less. Copper is ductile, hence there is a considerable length after the elastic limit before the fracture point.