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Q.

The work per unit volume to stretch the length by 1% of a wire with cross sectional area of 1 mm2 will be. Y=9×1011N/m2

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a

9×1011J

b

4.5×107J

c

9×107J

d

4.5×1011J

answer is B.

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Detailed Solution

U=12×Y×( Strain )2=12×9×1011×11002=4.5×107J
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The work per unit volume to stretch the length by 1% of a wire with cross sectional area of 1 mm2 will be. Y=9×1011N/m2