A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied which stretches their combined length by 1 cm. Then the two wires have
Correct answer: B. the same strain but different stresses
- A. the same stress and strain
- B. the same strain but different stresses
- C. the same stress but different strain
- D. different stresses and strains
Explanation
Since the wires are connected end to end and are subjected to the same force, they experience the same change in length. Therefore, they have the same strain. However, since the two wires are made of different materials (copper and steel), they have different Young's moduli. Thus, they experience different stresses for the same strain
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About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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