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Q.

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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a

both Y and η decrease

b

both Y and η increase

c

Y and η remain the same

d

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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