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Q.

A uniform steel bar of cross-sectional area A and length L is suspended, so that it hangs vertically. The stress at the middle point of the bar is (ρ is the density of steel)

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a

L2Aρg

b

Lρg2

c

LAρg

d

Lρg

answer is B.

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Detailed Solution

At middle, T = weight of half the length of steel bar=L2Apg∴  Stress =TA=Lρg2
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