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An Indian rubber cord 10 cm long is susp...

An Indian rubber cord 10 cm long is suspended vertically. How much does it stretch under its own weight ?
`(rho=1500 kg//m^(3), Y=5xx10^(8)N//m^(2), g=10m//s^(2))`

A

`5xx10^(-6)mm`

B

`15xx10^(-5)mm`

C

`10xx10^(-4)mm`

D

`20xx10^(-5) mm`

Text Solution

Verified by Experts

The correct Answer is:
B
`Y=(mgL)/(2Al) therefore l=(mgL)/(2YA)=(rho L^(2)g)/(2Y)`
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