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The breaking stress of a wire is 7.2xx10...

The breaking stress of a wire is `7.2xx10^(8)N//m^(2)` and density is `78xx10^(2) kg//m^(3)`. The wire is held vertically to the rigid support. The maximum length so that the wire does not break is

A

`9.94xx10^(3)m`

B

`9.4xx10^(3)m`

C

`94xx10^(3)`m

D

`940xx10^(3)`m

Text Solution

Verified by Experts

The correct Answer is:
B
Breaking stress `=rho L g`
`therefore L=(7.2xx10^(8))/(7.8xx10^(3)xx10)=9.4xx10^(3)m.`
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