Physics Elasticity Question 72
Question: The length of an iron wire is L and area of cross-section is A. The increase in length is l on applying the force F on its two ends. Which of the statement is correct
[NCERT 1976]
Options:
A) Increase in length is inversely proportional to its length L
B) Increase in length is proportional to area of cross-section A
C) Increase in length is inversely proportional to A
D) Increase in length is proportional to Young’s modulus
Show Answer
Answer:
Correct Answer: C
Solution:
$ l=\frac{FL}{YA}\Rightarrow l\propto \frac{1}{A} $
BETA
