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Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring.
Reason : Steel is more elastic than copper.
Options:
Reason : Steel is more elastic than copper.
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If both assertion and reason are true and reason is the correct explanation of assertion.
As, work done $=1 / 2 \times$ stress $\times$ strain $=1 / 2 \times Y \times(\text { strain })^2$ Since elasticity of steel is more than that of copper hence more work has to be done in order to stretch the steel.
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