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Rigidity modulus of steel is $η$ and its young's modulus is Y. A piece of steel of cross-sectional area ‘A’ is changed into a wire of length L and area A/10 then:

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both Y and $η$ decrease

both Y and $η$ increase

Y and $η$ remain the same

Y increases and $η$ decreases

answer is B.

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Detailed Solution

$η$ and Y are properties of material.

These coefficients are independent of geometry of body.

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