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Q.

In experiment for determination of Young’s modulus of a wire, the graph between weight of load (mg ) verses elongation (e) is as shown. If length and cross-sectional area of wire are 1.2 m and 10 mm2 respectively, then find its Young’s modulus .

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a

24 GPa

b

240 GPa

c

2.4 GPa

d

0.24 GPa

answer is D.

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Detailed Solution

Y=FlAΔl

Y=10×1.210−5×5×10−3=0.24×109 Pa

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