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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
E = Stress/Strain = F/A/e/L
E = FL/AE; F = EAe/L
Source: Myschool Past Questions Archive (Record #24301)