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Question

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.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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
Workdone=12×stress×strain=12×Y×(strain)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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