Q .     A uniform steel rod of `2.5mm^2` cross sectional area is heated through `40^oC`. The force enerted on it is _________. `(\alpha_{steel}=1.2\times 10^{-5}//^oC, Y_{steel}=2\times 10^{11}N/m^2)`

MHCET 2013
A

`480N`

B

`340N`

C

`240N`

D

`140N`

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