When a load of $10 \,kg$ is suspended on a metallic wire, its length increase by $2 \,mm$. The force constant of the wire is ........ $N / m$
  • A$3 \times 10^4$
  • B$2.5 \times 10^3$
  • C$5 \times 10^4$
  • D$7.5 \times 10^3$
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