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Year: 2020
Topic: Mechanical properties of solids
1. A wire of length L, area of cross-section A is hanging from a fixed support. The length of the wire changes to L1 when mass M is suspended from its free end. The expression for Young’s modulus is

(1).\(\frac{Mg\left(L_1 - L\right)}{AL}\)

(2). \(\frac{MgL}{AL_1}\)

(3). \(\frac{MgL}{A\left(L_1-L\right)}\)

(4). \(\frac{MgL_1}{AL}\)

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