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Q.

What force should be applied to the ends of steel rod of a cross sectional area 10 cm2 to prevent it from elongation when heated form 273 K to 303 k? (a of steel 10-5 °C-1, Y = 2 × 1011 Nm-2 )

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a

2 × 104N

b

3 × 104N

c

6 × 104N

d

12 × 104 N

answer is C.

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Detailed Solution

Δ=FlAY Increase in length, Δl=lαΔt from (1) and (2); FlAY=l α Δt⇒F=YAαΔT
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