Q.

A wire of length L and density ρ and Young's modulus Y is hanging from a support. Find the elongation in the length of wire at which wire will break:

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a

L2ρg2Y

b

2L2ρgY

c

L2ρgY 

d

L2ρg4Y

answer is A.

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Detailed Solution

Y = StressStrain = σll

l σLY = ALρgA.LY = L2ρgY

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