Physics · 2020
NEET 2020 · 13 September · Code E1 · Q161
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…
A wire of length $\displaystyle L$, area of cross section $\displaystyle A$ is hanging from a fixed support. The length of the wire changes to $\displaystyle \mathrm{L}_1$ when mass M is suspended from its free end. The expression for Young's modulus is :
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle \frac{\mathrm{MgL}}{\mathrm{A}\left(\mathrm{L}_1-\mathrm{L}\right)}$
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