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A uniform steel rod of 2.5 mm^2 cross se...

A uniform steel rod of `2.5 mm^2` cross sectional area is heated through `40^@C`. The force exerted it is ________. `(alpha_(steel) = 1.2 xx 10^-5 /^@ C, Y_(steel)= 2 xx 10^11 N/m^2)`

A

480N

B

340 N

C

240 N

D

140 N

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