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An electric string of length l is elastically stretched through a length e by a...

Physics
WAEC 1992
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
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Correct Answer: Option C
Explanation
E = Stress/Strain = F/A/e/L
E = FL/AE; F = EAe/L
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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