Q.
A substance breaks down under a stress of 105 Pa. If the density of the substance is 2×103Kg/m3 , find the minimum length of the wire made of this substance which will break under its own weight (g= 10 m/s2)
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a
10 m
b
2.5 m
c
4 m
d
5 m
answer is D.
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Detailed Solution
mgA=105⇒ALρgA=105⇒L=105ρg=5m
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