wire of length I has a ear mass density ...

wire of length I has a ear mass density `lambda` and area of cross-section A and the Young's modulus y is suspended vertically from rigid support. The extension produced in wire due to its own weight

(2`lambda`g`l^2`)/yA

(2`lambda`g`l^2`)/3yA

`lambda`g`l^2`/yA

`lambda`g`l^2`/2yA

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