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