Steel and copper wires of same length are stretched by the same weight one after the other. Young's modulus of steel and copper are $2 \times {10^{11}}\,N/{m^2}$ and $1.2 \times {10^{11}}\,N/{m^2}$. The ratio of increase in length
  • A$\frac{2}{5}$
  • B$\frac{3}{5}$
  • C$\frac{5}{4}$
  • D$\frac{5}{2}$
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