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A steel rod of diameter 1 cm is clamped firmly at each end when its temperature is 25 degrees celcius so that it cannot contract on cooling. The tension in the rod at 0 degrees celcius is
a) 4000 N
b) 7000 N
c) 7400 N
d) 4700 N
answer:
change in length if it was not clamped(l')=l*alpha of steel* change of temp.
young's modulus of steel=tension/area*(l'/l)
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