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A wire of length \( \mathrm{L} \) , area of cross section \( \mathrm{A} \) is hanging from a fixed support. The length o…

Q1

A wire of length \( \mathrm{L} \) , area of cross section \( \mathrm{A} \) 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

\( \frac{\mathrm{Mg}\left(\mathrm{L}_{1}-\mathrm{L}\right)}{\mathrm{AL}} \)

b

\( \frac{\mathrm{MgL}}{\mathrm{AL}_{1}} \)

c

\( \frac{\mathrm{MgL}}{\mathrm{A}\left(\mathrm{L}_{1}-\mathrm{L}\right)} \)

d

\( \frac{\mathrm{MgL}_{1}}{\mathrm{AL}} \)

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