A stress of $1.5\,kg.wt/mm^2$ is applied to a wire of Young's modulus $5 \times 10^{11}\,N/m^2$ . The percentage increase in its length is
  • A$3 \times 10^{-4}$
  • B$3 \times 10^{-3}$
  • C$3 \times 10^{-5}$
  • D$3 \times 10^{-2}$
Medium
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