A wire of length L and radius r suspende...

A wire of length L and radius r suspended from rigid support of mass M gm be applied its free end, its elongation is `l`, then its Young's modulus is

`MgL//pi r^(2)l`

`pi r^(2)l//MgL`

`Mg//pi r^(2)L`

`ML//pi r^(2)g l`

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