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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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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)