In $CGS$ system, the Young's modulus of a steel wire is $2 \times {10^{12}}$. To double the length of a wire of unit cross-section area, the force required is
  • A$4 \times {10^6}$ dynes
  • B$2 \times {10^{12}}$ dynes
  • C$2 \times {10^{12}}$ newtons
  • D$2 \times {10^8}$ dynes
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