Youngs Modulus Hey guys, i tried this problem on youngs modulas and got the wrong answer :surprised So i was wondering if anyone could tell me where i went wrong here or tell me how to do it properly. Problem: A 20cm brass wire of radius 1.0mm experiences an elongation of 0.49mm when a tensile force of 1.0 kN is applied. Calculate the youngs modulas of brass. E=σ/Є σ = F/A Є=ΔL/L F=1000 N A=0.2*0.001 ΔL=4.9*10^-4 L=1.0*^-3 Є = 4.9*10^-4/1.0X10^-3 σ = 1000/0.2*0.001 E= (1000/0.2*0.001)/(4.9*10^-4/1.0X10^-3) That came out as 1.0*10^7 for me. The answer is apparently 1.3*10^11 Any help on this would be good.