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?
- F = EA/eI
- F = EAI/e
-
F = EAe/l
- F = EAe
The correct answer is: C
Explanation
E = Stress/Strain = F/A/e/LE = FL/AE; F = EAe/L