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Q.

A steel rod of cross sectional area 1 m2 is acted upon by forces shown in figure. The elongation of the length BC of the rod is (Y=2.0×1011N/m2)

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a

5×10−7m

b

13×10−7m

c

3.5×10−7m

d

4.5×10−7m

answer is D.

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Detailed Solution

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The bar is at equilibrium. The net force from right or left of a section of BC is 70 kN.

Δl=FlAY=(70×103)×11×2×1011

⇒Δl=3.5×10−7m

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