Why the spring is made of steel in comparison of copper
Correct answer: C. Steel is more elastic than copper
- A. Copper is more costly than steel
- B. Copper is more elastic than steel
- C. Steel is more elastic than copper
- D. None of the above
Explanation
The primary reason for using steel over copper in making springs is steel's superior elasticity. Elasticity is a material's ability to deform under stress and return to its original shape when the stress is removed. Steel, due to its higher elastic limit, is better suited for applications like springs, where repeated deformation and recovery are necessary. Copper, while a good conductor and relatively ductile, does not match steel's elasticity, making it less appropriate for this application. While cost may be a consideration, it is not the determining factor in this context. Hence, option C is correct, and options A, B, and D are incorrect for the reasons stated.
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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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