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 ?

l \propto \frac{1}{L}

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l \propto A

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l \propto \frac{1}{A}

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l \propto Y

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Solution

The correct option is C $l \propto \frac{1}{A}$
We know $\to l = \frac{F L}{A Y}$
$l \propto \frac{1}{A}$

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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 ?

The correct option is C l∝1AWe know →l=FLAYl∝1A

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 ?

The correct option is C $l \propto \frac{1}{A}$
We know $\to l = \frac{F L}{A Y}$
$l \propto \frac{1}{A}$