On applying a stress of $20 \times {10^8}N/{m^2}$ the length of a perfectly elastic wire is doubled. Its Young’s modulus will be
  • A$40 \times {10^8}N/{m^2}$
  • B$20 \times {10^8}N/{m^2}$
  • C$10 \times {10^8}N/{m^2}$
  • D$5 \times {10^8}N/{m^2}$
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