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Q.

A brass rod of cross-sectional area 1 cm2 and length 0.2 m is compressed lengthwise by a weight of 5 kg. If Yourg's modulus of elasticity of brass is 1×1011N/m2 and g = 10 ms-2 then increase in the energy of the rod will be

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a

10−5J

b

2.5×10−5J

c

5×10−5J

d

2.5×10−4J

answer is B.

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Detailed Solution

U=12×( Stress )2Y× Volume =12×F2×A×LA2×Y=12×F2LAY=12×(50)2×0.21×10−4×1×1011=2.5×10−5J
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