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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:

A

`sqrt(L_1L_2)`

B

`(L_1+L_2)/2`

C

`2L_1-L_2`

D

`3L_1-2L_2`

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