In determination of young modulus of elasticity of wire, a force is applied and extension is recorded. Initial length of wire is '1 m'. The curve between extension and stress is depicted then Young's modulus of wire will be K × 109 Nm2, where K is .
We know that,
Youngs modulus = Y = SressStrain
⟹Y=FAΔll
Y=4000×1032×10−31
Y=4000×1032×10−3=2×109 Nm2.
Thus, K = 2.