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
Correct Answer: Option C
Explanation
E = Stress/Strain = F/A/e/L
E = FL/AE; F = EAe/L