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An iron rod of length 2m and cross section area of 50\,m{{m}^{2}}, stretched by 0.5 mm, when a mass of 250 kg is hung from its lower end. Young's modulus of the iron rod is [AFMC 1999]A) 19.6\times {{10}^{10}}\,N/{{m}^{2}} B) 19.6\times {{10}^{15}}\,N/{{m}^{2}} C) 19.6\times {{10}^{18}}\,N/{{m}^{2}} D) 19.6\times {{10}^{20}}\,N/{{m}^{2}} |
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