Why a spring is made of steel and not of copper ?

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A better spring must have large restoring force when deformed. Restoring force depen upon the elasticity of the material of the spring. As the Young's modulus of steel is greae than that of copper, so large restoring force is developed in steel in comparison to copper when external applied force (Deforming force) is removed. This fulfils the purpose for which a spring is required. So this is the reason why steel is preferred to copper in making a spring.


Note : Steel is also more elastic than rubber.

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