• # question_answer A steel rod of 1 sq. cm. cross sectional area is 100 cm long and has a Young's modulus of elasticity $2\times {{10}^{6}}\,\text{kg/c}{{\text{m}}^{\text{2}}}.$it is subjected to an axial pull of 2000 kgf. The elongation of the rod will be: A) 0.05 cm            B) 0.1 cmC) 0.15 cm            D) 0.20 cm

Correct Answer: B

Solution :

$A=1\,\,c{{m}^{2}},$ l=100 cm, $E=2\times {{10}^{6}}\text{kgf/c}{{\text{m}}^{\text{2}}}$ W=2000 kgf $dt=\frac{Wl}{AE}=\frac{2000\times 100}{1\times 2\times {{10}^{6}}}=0.1cm$

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