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The breaking stress for a metal wire is ...

The breaking stress for a metal wire is `2 xx 10^(8)Nm^(-2)`. Density of metal `=8 xx 10^(3) kg m^(-3)`. Calculate the maximum length of copper wire which will not break under its own weight, when held in vertical position.

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Breaking stress `=(Mg)/(A) = ((AL rho)g)/(A) = L rho g`
`:. L= ("Breaking stress")/( rho g)`
or `L= (2 xx 10^(8))/(8 xx 10^(3) xx 10) or L= 2500m`
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