An Indian rubber cord L metre long and area of cross - section A meter ^2 is suspended vertically. Density of rubber is r kg/ meter ^3 and Young's modulus of rubber is Y Newton/metre ^2 . If the cord extends by l metre under its own weight, then extension l is: a.L^2rgY b.L^2rg2Y c.L^2rg4Y d.YL^2rg

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An Indian rubber cord L metre long and area of cross - section A meter ^2 is suspended vertically. Density of rubber is r kg/ meter ^3 and Young's modulus of rubber is Y Newton/metre ^2 . If the cord extends by l metre under its own weight, then extension l is:

c.L^2rg4Y

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