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. A. Mg(L 1-L) AL
2. B. MgL AL 1
3. C. MgL A(L 1-L)
4. D. MgL 1 AL

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