JEE MainPhysicsModerateMechanical properties of matter

The following four wires are made of the same material. Which of
these will have the largest extension when the same tension is applied?
fuEu pkj rkj leku inkFkZ ds cus
vf/kdre gksxk tc leku ruko vkjksfir A

Show answer and solution

Y = \frac{FL}{\pi r^{2}\mathcal{l}}

\therefore\mathcal{l =}\frac{FL}{\pi r^{2}Y} \Rightarrow \mathcal{l \propto}\frac{L}{r^{2}}

\therefore\frac{L}{r^{2}}

is greatest for option A. fodYi A

Source: Grass-G / Ph-26 Physics paper 1 15 Jan.docx

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