A uniform rod of length L, has a mass ...

A uniform rod of length `L`, has a mass per unit length `lambda` and area of cross section `A`. The elongation in the rod is `l` due to its own weight, if it suspended form the celing of a room. The Young's modulus of the rod is

`(2lambdagL^(2))/(AY)`

`(lambdagL^2)/(AY)`

`(lambdagL^(2))/(4AY)`

`(lambdagL^(2))/(2AY)`

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