A wire of length $L,$ area of cross section $A$ is hanging from a fixed support. The length of the wire changes to $L_{1}$ when mass $M$ is suspended from its free end. The expression for Young's modulus is
A wire of length $L,$ area of cross section $A$ is hanging from a fixed support. The length of the wire changes to $L_{1}$ when mass $M$ is suspended from its free end. The expression for Young's modulus is
- [NEET 2020]
- A
$\frac{ MgL }{ A \left( L _{1}- L \right)}$
- B
$\frac{ MgL _{1}}{ AL }$
- C
$\frac{ Mg \left( L _{1}- L \right)}{ AL }$
- D
$\frac{ MgL }{ AL _{1}}$
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- [JEE MAIN 2021]
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