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Q.

A brass wire of diameter 1 mm and of length 2m is stretched by applying a force of 20N. If the increase in length is 0.51 mm,  Then the Young’s modulus of the wire is

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a

9.984×1010N/m2

b

8.848×1010N/m2

c

7.948×1010N/m2

d

6.984×1010N/m2

answer is D.

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Detailed Solution

y=Fπr2e =20×2π12×10-30.51×10-3=9.984×1010N/m2

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