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Calculate the increase in energy of steel rod of 2m and crosssectional area $4cm^2$,when a 500N force is applied on it.$Y_{steel}=2\times 10^{11}N/m^2$

$\begin{array}{1 1}(A)\;2.04\times 10^{-5}J\\(B)\;3.14\times 10^{-5}J\\(C)\;4.35\times 10^{-5}J\\(D)\;\text{None}\end{array} $

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