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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
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B
lA
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C
l1A
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D
lY
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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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