Question

# An iron bar of length $$L$$, cross-section $$A$$ and Young's modulus $$Y$$ is pulled by a force $$F$$ from ends so as to produce an elongation $$l$$. Which of the following statements is correct ?

A
l1L
B
lA
C
l1A
D
lY

Solution

## The correct option is C $$l \propto \dfrac{1}{A}$$We know $$\rightarrow l =\dfrac{FL}{AY}$$$$l \propto \dfrac{1}{A}$$Physics

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