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 ma
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
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Correct Answer - B
Breaking stress `=rho L g`
`therefore L=(7.2xx10^(8))/(7.8xx10^(3)xx10)=9.4xx10^(3)m.`
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