A wire of length L,area of cross section...

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:

`((MgL)/(AL))`

`((Mg(L_1-L))/(AL))`

`((MgL)/(AL_1))`

`((MgL)/(A(L_1-L))`

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