If a load of $9$ $kg$ is suspended on a wire, the increase in length is $4.5\, mm$. The force constant of the wire is
  • A$0.49 \times {10^4}\,N/m$
  • B$1.96 \times {10^4}\,N/m$
  • C$4.9 \times {10^4}\,N/m$
  • D$0.196 \times {10^4}\,N/m$
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