An electric string of length l is elastically stretched through a length e by a force F. The area of cross- section of the string is A and its Young’s modulus is E. Which of the following expressions is correct?

  • A F = EA/eI
  • B F = EAI/e
  • C F = EAe/l
  • D F = EAe
waec 1992physics

The correct answer is C. F = EAe/l

E = Stress/Strain = F/A/e/L

E = FL/AE; F = EAe/L

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