Physics · PYQ NEET UG 2020

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

1. \( \frac{Mg(L_1 - L)}{AL} \)
2. \( \frac{MgL}{AL_1} \)
3. \( \frac{MgL}{A(L_1 - L)} \)
4. \( \frac{MgL_1}{AL} \)