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.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$W o r k d o n e = \frac{1}{2} \times s t r e s s \times s t r a i n = \frac{1}{2} \times Y \times (s t r a i n)^{2}$
Since, elasticity of steel is more than copper, hence more work has to be done in order to stretch the steel.

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